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1 she said i ........................ an angel a am b was c were d have been 2 i have ever told you he ................................. unreliable a is b were c had been d would be 3 john asked me .............................. in english a what does this word mean b what that word means c what did this word mean d what that word meant 4 laura said she had worked on the assignment since .............................. a yesterday b two days ago c the day before d the next day 5 john asked me...
Đọc tiếp

1 she said i ........................ an angel a am b was c were d have been 2 i have ever told you he ................................. unreliable a is b were c had been d would be 3 john asked me .............................. in english a what does this word mean b what that word means c what did this word mean d what that word meant 4 laura said she had worked on the assignment since .............................. a yesterday b two days ago c the day before d the next day 5 john asked me ............................ that film the night before a that i saw b had i seen c if i had seen d if had i seen 6 she asked me........................................... a where was her umbrella b where her umbrella was c where where her umbrella d where her umbrella were 7 nancy asked me why i had not gone to new york the summer.................................. a before b ago c last d previous 8 andrew told me that they ........................... fish two previous days a have not eaten b had not eaten c did not eat d would not eat 9 jason told me that he ............................ his best in the exam the following day a had done b will do c would do d was doing

1
22 tháng 5 2017

1 b-was

2 c-had been

3- d,4-c,5-c,6-b,7-a,8-b,9-c

1 she said i ........................ an angel a am b was c were d have been 2 i have ever told you he ................................. unreliable a is b were c had been d would be 3 john asked me .............................. in english a what does this word mean b what that word means c what did this word mean d what that word meant 4 laura said she had worked on the assignment since .............................. a yesterday b two days ago c the day before d the next day 5 john asked me...
Đọc tiếp

1 she said i ........................ an angel a am b was c were d have been 2 i have ever told you he ................................. unreliable a is b were c had been d would be 3 john asked me .............................. in english a what does this word mean b what that word means c what did this word mean d what that word meant 4 laura said she had worked on the assignment since .............................. a yesterday b two days ago c the day before d the next day 5 john asked me ............................ that film the night before a that i saw b had i seen c if i had seen d if had i seen 6 she asked me........................................... a where was her umbrella b where her umbrella was c where where her umbrella d where her umbrella were 7 nancy asked me why i had not gone to new york the summer.................................. a before b ago c last d previous 8 andrew told me that they ........................... fish two previous days a have not eaten b had not eaten c did not eat d would not eat 9 jason told me that he ............................ his best in the exam the following day a had done b will do c would do d was doing

2
23 tháng 5 2017

1 she said i ........................ an angel
a am b was c were d have been
2 i have ever told you he ................................. unreliable
a is b were c had been d would be
3 john asked me .............................. in english a what does this word mean b what that word means c what did this word mean d what that word meant
4 laura said she had worked on the assignment since .............................. a yesterday b two days ago c the day before d the next day
5 john asked me ............................ that film the night before a that i saw b had i seen c if i had seen d if had i seen
6 she asked me...........................................
a where was her umbrella b where her umbrella was c where where her umbrella d where her umbrella were
7 nancy asked me why i had not gone to new york the summer..................................
a before b ago c last d previous
8 andrew told me that they ........................... fish two previous days a have not eaten b had not eaten c did not eat d would not eat
9 jason told me that he ............................ his best in the exam the following day a had done b will do c would do d was doing

23 tháng 5 2017

9 jason told me that he ............................ his best in the exam the following day
a had done b will do c would do d was doing

Bài tập 2: Chon từ hoặc cụm từ thích hợp để hoàn thành những câu sau.1. She said I _______ an angel.A. am B. was C. were D. have been2. I have ever told you he _______ unreliable.A. is B. were C. had been D. would be3. John asked me _______ in English.A. what does this word mean B. what that word meansC. what did this word mean D. what that word meant4. Laura said she had worked on the assignment since _______.A. yesterday B. two days ago C. the day before D. the next day5....
Đọc tiếp

Bài tập 2: Chon từ hoặc cụm từ thích hợp để hoàn thành những câu sau.
1. She said I _______ an angel.
A. am B. was C. were D. have been
2. I have ever told you he _______ unreliable.
A. is B. were C. had been D. would be
3. John asked me _______ in English.
A. what does this word mean B. what that word means
C. what did this word mean D. what that word meant
4. Laura said she had worked on the assignment since _______.
A. yesterday B. two days ago C. the day before D. the next day
5. John asked me _______ that film the night before.
A. that I saw B. had I seen C. if I had seen D. if had I seen
6. She asked me _______.
A. where was her umbrella B. where her umbrella was
C. where were her umbrella D. where her umbrella were
7. Nancy asked me why I had not gone to New York the summer _______.
A. before B. ago C. last D. previous
8. Andrew told me that they _______ fish two previous days.
A. have not eaten B. had not eaten
C. did not eat D. would not eat
9. Jason told me that he _______ his best in the exam the following day.
A. had done B. will do C. would do D. was going
10. Did they say they __________ me again ?
A. will phone B. have phoned C. would phone D. had phoned

2
31 tháng 10 2021

1 B

2 A

3 D

4 C

5 C

6 B

7 A

8 B

9 C

10 C

31 tháng 10 2021

1. b

2. a

3. d

4. c

5. c

6. b

7. a

8. b

9. c

10. c

Bài tập 2: Chon từ hoặc cụm từ thích hợp để hoàn thành những câu sau.1. She said I _______ an angel.A. am B. was C. were D. have been2. I have ever told you he _______ unreliable.A. is B. were C. had been D. would be3. John asked me _______ in English.A. what does this word mean B. what that word meansC. what did this word mean D. what that word meant4. Laura said she had worked on the assignment since _______.A. yesterday B. two days ago C. the day before D. the next day5....
Đọc tiếp

Bài tập 2: Chon từ hoặc cụm từ thích hợp để hoàn thành những câu sau.
1. She said I _______ an angel.
A. am B. was C. were D. have been
2. I have ever told you he _______ unreliable.
A. is B. were C. had been D. would be
3. John asked me _______ in English.
A. what does this word mean B. what that word means
C. what did this word mean D. what that word meant
4. Laura said she had worked on the assignment since _______.
A. yesterday B. two days ago C. the day before D. the next day
5. John asked me _______ that film the night before.
A. that I saw B. had I seen C. if I had seen D. if had I seen
6. She asked me _______.
A. where was her umbrella B. where her umbrella was
C. where were her umbrella D. where her umbrella were
7. Nancy asked me why I had not gone to New York the summer _______.
A. before B. ago C. last D. previous
8. Andrew told me that they _______ fish two previous days.
A. have not eaten B. had not eaten
C. did not eat D. would not eat
9. Jason told me that he _______ his best in the exam the following day.
A. had done B. will do C. would do D. was going
10. Did they say they __________ me again ?
A. will phone B. have phoned C. would phone D. had phoned

1
31 tháng 10 2021

1 C

2 A

3 D

4 C

5 C

6 B

7 A

8 B

9 C

10 C

1,she said................collect it for me after work a,would b,did c,must d,had 2,she said i....................an angel a,am b,was c,were d,have been 3,she said that he....................unreliable a,is b,were c,was d,would be 4,she asked me where i......................from a,come b,coming c,to come d,came 5,she....................me whether i liked classical music or not a,asks b,told c,asked d,b&c 6,i worder why he....................love his family a,doesn't b,don't c,didn't...
Đọc tiếp

1,she said................collect it for me after work

a,would b,did c,must d,had

2,she said i....................an angel

a,am b,was c,were d,have been

3,she said that he....................unreliable

a,is b,were c,was d,would be

4,she asked me where i......................from

a,come b,coming c,to come d,came

5,she....................me whether i liked classical music or not

a,asks b,told c,asked d,b&c

6,i worder why he....................love his family

a,doesn't b,don't c,didn't d,hasn't

7,they asked me how many children..............................

a,if i had b,had i c,i have d,i had

8,the student said that the english test..........................the most difficult

a,is b,was c,will be d,have been

9,he advised......................too far

a,her did not go b,her do not do c,her not to go d,she did not go

10,the guest told the host that.........................

a,i must go now b,he must go now c,he had to go now d,he had to go then

11,my parents asked me.............................about my fault

a,to explain b,explain c,explaining d,explained

12,today is my happinest day of my life

the groom.said .........................the happinest day of his life

a,today was b,that day was c,that day is d,yesterday was

1
11 tháng 3 2019

1,she said................collect it for me after work

a,would b,did c,must d,had

2,she said i....................an angel

a,am b,was c,were d,have been

3,she said that he....................unreliable

a,is b,were c,was d,would be

4,she asked me where i......................from

a,come b,coming c,to come d,came

5,she....................me whether i liked classical music or not

a,asks b,told c,asked d,b&c

6,i worder why he....................love his family

a,doesn't b,don't c,didn't d,hasn't

7,they asked me how many children..............................

a,if i had b,had i c,i have d,i had

8,the student said that the english test..........................the most difficult

a,is b,was c,will be d,have been

9,he advised......................too far

a,her did not go b,her do not do c,her not to go d,she did not go

10,the guest told the host that.........................

a,i must go now b,he must go now c,he had to go now d,he had to go then

11,my parents asked me.............................about my fault

a,to explain b,explain c,explaining d,explained

12,today is my happinest day of my life

the groom.said .........................the happinest day of his life

a,today was b,that day was c,that day is d,yesterday was

30 tháng 8 2022

sai r c ơi (ykr)

2. A

3. A

5. c

6. a

7. c

8. a

1 if i ............ the bus this afternoon , i will get a taxi instead a miss b will miss c missed d had missed 2 we will have to go without john if he .............. soon a will not arrive b will arrive c arrives d does not arrive 3 if i make some coffee , ................ the cake ? a do you cut b will you cut c are you cutting d do not you cut 4 if you ............... your homework , i ...................... you watch tv a will not do / let b will press/comes c press / can come d have...
Đọc tiếp

1 if i ............ the bus this afternoon , i will get a taxi instead a miss b will miss c missed d had missed 2 we will have to go without john if he .............. soon a will not arrive b will arrive c arrives d does not arrive 3 if i make some coffee , ................ the cake ? a do you cut b will you cut c are you cutting d do not you cut 4 if you ............... your homework , i ...................... you watch tv a will not do / let b will press/comes c press / can come d have pressed / will comes 5 ............... you , i would think twice about that decision . it could be a bad move a if i am b should i be c were i d if i had been 6 would you like some cake ? - no thanks . if i ................ cake , i ...........fat . a ate/will get b ate / would get c would eat / could get d am eating/will get 8 pam broke her arm in the accident . it ................. much worse if she had not been wearing her seat belt a will be b would have been c was d were 9 my boss made me work overtime again . - if i ............ you , i ................ my job a were / would have quit b am/ will quit c was/must quit d were / would quit 10 john went to the hospital alone - did he ? if he ............. me with him a told/ would go b told / might have gone c had told / could go d had told/would have gone

1
26 tháng 4 2017

1 if i ............ the bus this afternoon , i will get a taxi instead

a miss b will miss c missed d had missed

2 we will have to go without john if he .............. soon

a will not arrive b will arrive c arrives d does not arrive

3 if i make some coffee , ................ the cake ?

a do you cut b will you cut c are you cutting d do not you cut

4 if you ............... your homework , i ...................... you watch tv

a will not do / let b will press/comes c press / can come d have pressed / will comes

5 ............... you , i would think twice about that decision . it could be a bad move

a if i am b should i be c were i d if i had been

6 would you like some cake ? - no thanks . if i ................ cake , i ...........fat .

a ate/will get b ate / would get c would eat / could get d am eating/will get

8 pam broke her arm in the accident . it ................. much worse if she had not been wearing her seat belt

a will be b would have been c was d were

9 my boss made me work overtime again . - if i ............ you , i ................ my job

a were / would have quit b am/ will quit c was/must quit d were / would quit

10 john went to the hospital alone - did he ? if he ............. me,i ... with him

a told/ would go b told / might have gone c had told / could go d had told/would have gone

1 we did not visit the museum because we had no time a if we have time , we will visit the museum b if we had time , we would visit the museum c if we had had time , we would have visited the museum d if we had had time , we will visit the museum 2 he looked frightened as if he ................ a ghost a sees b is seeing c has seen d had seen 3 ........... resigned , we would have been forced to sack him a had he not b had not he c he had not d he not had 4 if you ................ me about the...
Đọc tiếp

1 we did not visit the museum because we had no time a if we have time , we will visit the museum b if we had time , we would visit the museum c if we had had time , we would have visited the museum d if we had had time , we will visit the museum 2 he looked frightened as if he ................ a ghost a sees b is seeing c has seen d had seen 3 ........... resigned , we would have been forced to sack him a had he not b had not he c he had not d he not had 4 if you ................ me about the bad service , we’d have eaten there a did not tell b would not have told c had not told d had told 5 the teacher was absent today, so class was canceled . if she ........... absent again tomorrow , class ........ tomorrow,too a is/will cancel b is / will be canceled c was / would be canceled d was/ would cancel 6 if you .................. to my advice in the first place , you............... in this mess right now a listen/will be b had listened / would not have been c will listened / would not be d had listened/ would not be 7 if i had been absent from class yesterday , i ............. the math test a would missed b would have missed c will miss d miss 8 if you ............... here earlier , you ............. her a had come / would have met b come / meet c came / would meet d comes will meet 9 i think you should stop smoking a if i am you , i will stop smoking b if i were you , i will stop smoking c if i were you , i would stop smoking d if i had been you , i would stop smoking 10 if i were , i would work harder a you would rather not work so hard c you should work harder c you should work with me d do not work so hard

1
27 tháng 4 2017

1 we did not visit the museum because we had no time

a if we have time , we will visit the museum

b if we had time , we would visit the museum

c if we had had time , we would have visited the museum

d if we had had time , we will visit the museum

2 he looked frightened as if he ................

a ghost a sees b is seeing c has seen d had seen

3 ........... resigned , we would have been forced to sack him

a had he not b had not he c he had not d he not had

4 if you ................ me about the bad service , we’d have eaten there

a did not tell b would not have told c had not told d had told

5 the teacher was absent today, so class was canceled . if she ........... absent again tomorrow , class ........ tomorrow,too

a is/will cancel b is / will be canceled c was / would be canceled d was/ would cancel

6 if you .................. to my advice in the first place , you............... in this mess right now

a listen/will be b had listened / would not have been c will listened / would not be d had listened/ would not be

7 if i had been absent from class yesterday , i ............. the math test

a would missed b would have missed c will miss d miss

8 if you ............... here earlier , you ............. her

a had come / would have met b come / meet c came / would meet d comes will meet

9 i think you should stop smoking

a if i am you , i will stop smoking

b if i were you , i will stop smoking

c if i were you , i would stop smoking

d if i had been you , i would stop smoking

10 if i were , i would work harder

a you would rather not work so hard

b you should work harder

c you should work with me

d do not work so hard

. If you ______ be someone, who______ you ______?A. could / would / have been B. could / would / be C. can / will / be D. are able to / will / be 24. If I ________ an Angel, I would try to make happy all the children.A. am B. have been C. were D. had been25. John would be taking a great risk if he _____ his money in that business.A. would invest B. invested C. had invested D. invests26. It ________ if nobody had reminded them.A. would have be forgot B. would have been forgotC. would have forget...
Đọc tiếp

. If you ______ be someone, who______ you ______?

A. could / would / have been B. could / would / be C. can / will / be D. are able to / will / be 24. If I ________ an Angel, I would try to make happy all the children.

A. am B. have been C. were D. had been

25. John would be taking a great risk if he _____ his money in that business.

A. would invest B. invested C. had invested D. invests

26. It ________ if nobody had reminded them.

A. would have be forgot B. would have been forgot

C. would have forget D. would have been forget

27. The car ________ if somebody takes it there.

A. will be repaired B. would be repaired C. will been repaired D. is repair

28. You ______ to prison if you did that.

A. would be send B. would have been sent C. would be sent D. were sent

29. You would study Italian if it _____ here.

A. was teaching B. were taught C. would be taught D. is taught

30. It _______ if nobody reminded them

A. was forgotten B. would be forget C. would be forgot D. would forgot

31. The magazine _____ by more people if it had better articles.

A. would be reading B. would read C. would be read D. been read

32. The joke would not be funny if it _________ into French.

A. were translated B. is translated C. was be translated D. translated

33. A doctor _________ if somebody falls ill.

A. will be cold for B. will be called for C. will call for D. would be call for

34. Would she go if she _____?

A. were invited B. was be invited C. have been invited D. be invited

35. He _____ the death penalty if he were found guilty.

A. would be given B. would be gave C. would given D. were given

36. Who would have won the World War II if the nuclear bomb __ by the Nazus first.

A. had be produced B. had produced C. had been produced D. would be produced

37. The room ______ if it is not empty.

A. couldn’t be repainted B. cannot be repainted

C. could be repainted D. can be repainted

38. He _____ the death penalty if he had been found guilty.

A. would has given B. would has been given

C. would have given D. would have been given

39. The cars _____ if we had not done such a huge advertising campaign.

A. would not have been bought B. would not have be bought

C. would have been bought D. would not had been bought

40. If I were a better conversationalist , _____ to parties more often?

A. I would be invited B. I would have been invited

C. would I be invited D. would I have been invited

41.Kevin never seems to get tired. I wish I _____ his energy

A. can have B. have had C. had D. would have

42. If I ____ him yesterday, I would have to come back tomorrow

A. didn’t meet B. have met C. met D. hadn’t met

43. If she ____ the truth, I think she’d never want to see you again

A. would know B. knows C. will know D. knew

44. I would never have believed ____ it with my own eyes

A. if I didn’t see B. if I hadn’t seen

C. if I haven’t seen D. if I wouldn’t have seen

45. I wish I had remembered your number. Otherwise, I ____ you

A. phoned B. would phone C. would have phoned D. will have phone

46. Such typing mistakes _____ avoided if you had been more careful

A. can have been C. would be C. might have been D. should be

47. Carol was late for work this morning. But for the traffic jam, she ____ half an hour earlier

A. could come B. could have come C. had come D. can have come

48. Don’t worry ____ home late tonight

A. when I’ll be B. if I’ll be C. unless I’ll be D. if I’m

49. I ____ one of my special desserts for dinner, if you like

A. make B. will make C. am going to make D. am making

50. When you ____ Bob, tell him he still owes me some money

A. see B. are going to see C. will see D. are seeing

51. I wish I ____ him, but I don’t

A. like B. can like C. liked D. would like

52. She feels lonely because she doesn’t know many people there. She wishes she ____ more people

A. will know B. knew C. knows D. has known

1
14 tháng 7 2021

. If you ______ be someone, who______ you ______?

A. could / would / have been B. could / would / be C. can / will / be D. are able to / will / be

24. If I ________ an Angel, I would try to make happy all the children.

A. am B. have been C. were D. had been

25. John would be taking a great risk if he _____ his money in that business.

A. would invest B. invested C. had invested D. invests

26. It ________ if nobody had reminded them.

A. would have be forgot B. would have been forgot

C. would have forget D. would have been forget

27. The car ________ if somebody takes it there.

A. will be repaired B. would be repaired C. will been repaired D. is repair

28. You ______ to prison if you did that.

A. would be send B. would have been sent C. would be sent D. were sent

29. You would study Italian if it _____ here.

A. was teaching B. were taught C. would be taught D. is taught

30. It _______ if nobody reminded them

A. was forgotten B. would be forget C. would be forgot D. would forgot

31. The magazine _____ by more people if it had better articles.

A. would be reading B. would read C. would be read D. been read

32. The joke would not be funny if it _________ into French.

A. were translated B. is translated C. was be translated D. translated

33. A doctor _________ if somebody falls ill.

A. will be cold for B. will be called for C. will call for D. would be call for

34. Would she go if she _____?

A. were invited B. was be invited C. have been invited D. be invited

35. He _____ the death penalty if he were found guilty.

A. would be given B. would be gave C. would given D. were given

36. Who would have won the World War II if the nuclear bomb __ by the Nazus first.

A. had be produced B. had produced C. had been produced D. would be produced

37. The room ______ if it is not empty.

A. couldn’t be repainted B. cannot be repainted

C. could be repainted D. can be repainted

38. He _____ the death penalty if he had been found guilty.

A. would has given B. would has been given

C. would have given D. would have been given

39. The cars _____ if we had not done such a huge advertising campaign.

A. would not have been bought B. would not have be bought

C. would have been bought D. would not had been bought

40. If I were a better conversationalist , _____ to parties more often?

A. I would be invited B. I would have been invited

C. would I be invited D. would I have been invited

41.Kevin never seems to get tired. I wish I _____ his energy

A. can have B. have had C. had D. would have

42. If I ____ him yesterday, I would have to come back tomorrow

A. didn’t meet B. have met C. met D. hadn’t met

43. If she ____ the truth, I think she’d never want to see you again

A. would know B. knows C. will know D. knew

44. I would never have believed ____ it with my own eyes

A. if I didn’t see B. if I hadn’t seen

C. if I haven’t seen D. if I wouldn’t have seen

45. I wish I had remembered your number. Otherwise, I ____ you

A. phoned B. would phone C. would have phoned D. will have phone

46. Such typing mistakes _____ avoided if you had been more careful

A. can have been C. would be C. might have been D. should be

47. Carol was late for work this morning. But for the traffic jam, she ____ half an hour earlier

A. could come B. could have come C. had come D. can have come

48. Don’t worry ____ home late tonight

A. when I’ll be B. if I’ll be C. unless I’ll be D. if I’m

49. I ____ one of my special desserts for dinner, if you like

A. make B. will make C. am going to make D. am making

50. When you ____ Bob, tell him he still owes me some money

A. see B. are going to see C. will see D. are seeing

51. I wish I ____ him, but I don’t

A. like B. can like C. liked D. would like

52. She feels lonely because she doesn’t know many people there. She wishes she ____ more people

A. will know B. knew C. knows D. has known

1, If had follow your advice, I........happier now a, am b, should be c, will have been d, have been 2, If I.......more time, I should take up golf as a hobby a, have b, had c, has 3, If he..............here now , we would ask his opinion a, is b, were c, has been d, had been 4, If I ..........the chance , I would have trained to be a dortor a, would had b, would have c, have had d, had had 5, If I were you ...........phone and tell her you're going to be late a, I'd b, I'lll c, I'd...
Đọc tiếp

1, If had follow your advice, I........happier now

a, am b, should be c, will have been d, have been

2, If I.......more time, I should take up golf as a hobby

a, have b, had c, has

3, If he..............here now , we would ask his opinion

a, is b, were c, has been d, had been

4, If I ..........the chance , I would have trained to be a dortor

a, would had b, would have c, have had d, had had

5, If I were you ...........phone and tell her you're going to be late

a, I'd b, I'lll c, I'd have d, I

6, If I ..........convenient , lets it go out for a drink tonight

a, be b, is c, was d, were

7, If you ......time, please write to me

a, have b, had c, have had d, has

8, If it .........tomorrow, we may postpone going on a picnic

a, will rain b, rains c, shall rain d, raining

9, If you hadn't watched that late mivie last night , you ..........sleepy now

a, wouldn't have been b, wouldn't be c, might have not been d, wouldn't have been being

10, If you...........as I told you, you ............sorry now

a, did/would b, had done/had not been c, do /would not be d, had done/would not be

11, If only I .............him now

a, see b, saw c, have seen d, seen

1
16 tháng 7 2018

1, If had follow your advice, I........happier now

a, am b, should be c, will have been d, have been

2, If I.......more time, I should take up golf as a hobby

a, have b, had c, has

3, If he..............here now , we would ask his opinion

a, is b, were c, has been d, had been

4, If I ..........the chance , I would have trained to be a dortor

a, would had b, would have c, have had d, had had

5, If I were you ...........phone and tell her you're going to be late

a, I'd b, I'lll c, I'd have d, I

6, If I ..........convenient , lets it go out for a drink tonight

a, be b, is c, was d, were

7, If you ......time, please write to me

a, have b, had c, have had d, has

8, If it .........tomorrow, we may postpone going on a picnic

a, will rain b, rains c, shall rain d, raining

9, If you hadn't watched that late mivie last night , you ..........sleepy now

a, wouldn't have been b, wouldn't be c, might have not been d, wouldn't have been being

10, If you...........as I told you, you ............sorry now

a, did/would b, had done/had not been c, do /would not be d, had done/would not be

11, If only I .............him now

a, see b, saw c, have seen d, seen

18 tháng 7 2018

Choose the best answer for each of the following sentences
1. If I had time, I would go with you.
A. I am free and surely go with you.
B. I am too busy to go with you.
C. I will go with you because I have time.
D. I am free enough to go with you.

2. If Margaret hadn't been wearing a seat belt, she ____ Injured.
A. has been
B. would has been
C. would be
D. would have been

3. If I ____ the rain yesterday, I ______ ill.
A. had not caught / would have been
B. had not caught / would not have been
C. have not caught / were not
D. have not caught / would have been

4. He looked frightened as if he _____ a ghost.
A. sees
B. is seeing
C. has seen
D. had seen

5. What _____ if there _____ a serious nuclear accident.
A. will happen / was
B. happens / were
C. would happen / were
D. would happen / had been