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1. We/ used/ school/ on/ foot.……………………………………………………………………………………………………….2. about / 30km/ my town/ Ha Long Bay/.……………………………………………………………………………………………………….3. My family/ used/ go / holiday / seaside / summer/.……………………………………………………………………………………………………….4. How/ long / it /...
Đọc tiếp

1. We/ used/ school/ on/ foot.
……………………………………………………………………………………………………….


2. about / 30km/ my town/ Ha Long Bay/.
……………………………………………………………………………………………………….


3. My family/ used/ go / holiday / seaside / summer/.
……………………………………………………………………………………………………….


4. How/ long / it / take/ you/ Ha Noi / Sa Pa/?
……………………………………………………………………………………………………….


5. There / used / be / a factory / town centre / but/ it / move/ the/ suburbs/.
……………………………………………………………………………………………………….


6.  You/ must / learn / about / road safety/ before/ riding/ your/ bike/ road/.
…………………………………………………………………………………………

 

2
8 tháng 11 2021

1. We used to go to school on foot.

2. It's about 30 km from my town to a Long Bay.

3. My family used to go on holiday at the seaside in the summer.

4. How long does it take you to go from Hanoi to Sapa.

5. There used to be a factory in the town centre but it had been moved to the suburbs.

6. You must learn about road safety before riding your bike on the road.

8 tháng 11 2021

1. We used to go to school on foot.

2. It's about 30 km from my town to Hạ Long Bay.

3. My family used to go on holiday to the seaside in the summer.

4. How long does it take you to go from Hanoi to Sapa.

5. There used to be a factory in the town centre but it had been moved to the suburbs.

6. You must learn about road safety before riding your bike on the road.

1. We must be quick. There’s …………time left.   A. little B. few C. much D. more 2. He made the soup by mixing ………… meat with some rice.  A. little B. few   C. a little D. a few 3. Luckily, I ………few mistakes in my last exam. A. make B. made  C. have made  D. am making 4. You look very …………. I’m sure you play sports regularly. A. thin B. fat   C. fit D. well 5. Hamlet is an example of a ……. It has an unhappy ending. A. tragedy B. character C. comedy  D....
Đọc tiếp

1. We must be quick. There’s …………time left.   A. little B. few C. much D. more

 

2. He made the soup by mixing ………… meat with some rice.  A. little B. few   C. a little D. a few

 

3. Luckily, I ………few mistakes in my last exam. A. make B. made  C. have made  D. am making

 

4. You look very …………. I’m sure you play sports regularly. A. thin B. fat   C. fit D. well

 

5. Hamlet is an example of a ……. It has an unhappy ending. A. tragedy B. character C. comedy  D. play

 

6. I …………such nice and enthusiastic volunteers before.

 

A. never meet B. have never met C. never met D. will never meet

 

7. I want to pass the test, …………I’m studying hard.  A. but B. because C. so D. although

 

8. Paul is similar to his brother in their interest ………horse riding. A. to B. with    C. for D. in

 

9. I am not ready yet and …………A. she is too B. she is not C. so is she D. she isn’t either

 

10. They play was very long, but there were two……… A. intervals  B. rests  C. interruptions D. gaps

……………………………………………………………………………………….

6
8 tháng 11 2021

1. We must be quick. There’s …………time left.   A. little B. few C. much D. more

2. He made the soup by mixing ………… meat with some rice.  A. little B. few   C. a little D. a few

3. Luckily, I ………few mistakes in my last exam. A. make B. made  C. have made  D. am making

4. You look very …………. I’m sure you play sports regularly. A. thin B. fat   C. fit D. well

5. Hamlet is an example of a ……. It has an unhappy ending. A. tragedy B. character C. comedy  D. play

6. I …………such nice and enthusias volunteers before.

A. never meet B. have never met C. never met D. will never meet

7. I want to pass the test, …………I’m studying hard.  A. but B. because C. so D. although

8. Paul is similar to his brother in their interest ………horse riding. A. to B. with    C. for D. in

9. I am not ready yet and …………A. she is too B. she is not C. so is she D. she isn’t either

10. They play was very long, but there were two……… A. intervals  B. rests  C. interruptions D. gaps

……………………………………………………………………………………….

8 tháng 11 2021

1 A

2 C

3 B

4 C

5 A

6 B

7 C

8 D

9 C

10 A

Sandwiches are common in many countries. But (1) ……                 ……did this strange name come from? The Earl of Sandwich (1718 – 1792) was an Englishman. He liked (2) …                        ………cards. One night he played for hours and got very hungry. (3) ……                    …… he didn’t want to stop his card games. He asked for some roasts meat (4) …                            ……… two pieces of bread. (People bake roast meat in the oven or a stove). He...
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Sandwiches are common in many countries. But (1) ……                 ……did this strange name come from? The Earl of Sandwich (1718 – 1792) was an Englishman. He liked (2) …                        ………cards. One night he played for hours and got very hungry. (3) ……                    …… he didn’t want to stop his card games. He asked for some roasts meat (4) …                            ……… two pieces of bread. (People bake roast meat in the oven or a stove). He ate the food (5) ……                                       …… he played cards. People gave his name (6) ……                                           …… this new kind of food.

Pizza is (7) ……                                            ……international food. A baker probably (8) ………                            …the pizza in Naples, Italy. It was about the same time (9) ……                                                               …… the first sandwich. “Pizza” means “pie” in Italian. People (10) ……                                     …… the name “pizza pie” for a long time. Now it is just “pizza”.

1.                            A. what                                  B. when                              C. where                                     D. how

 

2. A. play                                                       B. played                                              C. plays                                D. playing

 

3. A. So                                                     B. Moreover                                                         C. But                              D. Because

 

4. A. for                               B. between                        C. on                         D. among

 

5. A. while                                           B. until                           C. after                                 D. before

 

6. A. to                                B. for                    C. from                                      D. with

 

7. A. other                       B. another                              C. others                               D. the other

 

8. A. did                                B. discovered                           C. invented                         D. found

 

9. A. than                            B. as                                                          C. like                                                D. from

 

10. A. was used                    B. have used                                               C. use                              D. used

1
8 tháng 11 2021

1.C

2.D

3.C

4.D

5.A

6.B

7.D

8.C

9.B

10.B

1. People invented the wheel thousands of years ago. __________________________________________ 2. Are they building a statue of Chu Van An? .                                                                                                                  3. Do four busy streets surround the Temple of Literature?                                                                                                       .4. They will not provide pencils at the test, so please bring your own.         ...
Đọc tiếp

1. People invented the wheel thousands of years ago. __________________________________________

 

2. Are they building a statue of Chu Van An? .                                                                                                                 

 

3. Do four busy streets surround the Temple of Literature?                                                                                                       

.

4. They will not provide pencils at the test, so please bring your own.                                                                                             

.

5. Mr. Binh hasn’t taught us since the last semester.                                                                                                                   

.

6. A student teacher is doing that experiment. .                                                                                                                                   

 

7. Did you buy this dictionary two weeks ago?                                                                                                                          

.

8. Alan’s knowledge about science and technology doesn’t impress me.                                                                                              

.

9. They are going to build a new school here next year.                                                                                                                             

.

10. I have used this computer for two years.                                                                                                                         

1
8 tháng 11 2021

1. The wheel was invented thousand of years ago.

2. Are the statue of Chu Van An being built (by them)?

3. Is Temple of Literature surrounded by four busy streets?

4. Pencils are not provided at the test, so please bring your own.

5.We hasn't been taught by Mr. Binh since the last semester.

6. That experiment is being done by a student teacher.

7. Was this dictionary bought (by you) two weeks ago?

8. I'm not impressed with Alan's knowledge about science and technology.

9. A new school is going to be built here next year (by them).

10. This computer have been used for two years (by me).

Kali có nguyên tử khối là 39 và hóa trị là I. 

8 tháng 11 2021

nguyên tử khối là 39

hóa trị I

1. Although Titanic is a …………………………..film, it has a sad ending. (ROMANCE)2. His recent film received a lot of ………………………….. from the public. (CRITIC)3. I don’t like horror films because they are too …………………………..for me. (FRIGHT)4. Do you know Daniel Day-Lewis? He has won three Oscars for Best…………………………… (ACT)5. The film was …………………………..though they spent millions of dollars making it....
Đọc tiếp

1. Although Titanic is a …………………………..film, it has a sad ending. (ROMANCE)


2. His recent film received a lot of ………………………….. from the public. (CRITIC)


3. I don’t like horror films because they are too …………………………..for me. (FRIGHT)


4. Do you know Daniel Day-Lewis? He has won three Oscars for Best…………………………… (ACT)


5. The film was …………………………..though they spent millions of dollars making it. (SUCCEED)


6. Big Ben Down is about a group of …………………………..who take control of Big Ben. (TERROR)


7. We were …………………………..with the service at the cinema. Everything was terrible. (SATISFY)


8. The film is a big…………………………… It is boring from beginning to end. (DISAPPOINT)


9. The film is about two hijackers who …………………………..to blow up the plane. (THREAT)


10. I don’t think it is good for young kids to see …………………………..on TV. (VIOLENT)

 

 

1
8 tháng 11 2021

1. roman 2. criism 3. frightening 4. actor 5. unsuccessful 6. terrorists 7. dissatisfied 8. disappointment 9. threatened 10. violence 

chúc học tốt 

1.Choose the best answer:1. She is____________old____________climb the mountain.A. very/ to B. enough/ to C. too/ to D. so/ to2. It is not_____________to pass the red traffic light.A. dangerous B. safe C. safety D. danger3. There are many_____________on the street: cars, buses, bikes, motorbikes…A. vehicles B. transport C. engines D. machines4. She spent all day_____________with her children.A. play B. to play C. played D. playing5. The central square is______________. It is full of people...
Đọc tiếp

1.Choose the best answer:

1. She is____________old____________climb the mountain.

A. very/ to B. enough/ to C. too/ to D. so/ to

2. It is not_____________to pass the red traffic light.

A. dangerous B. safe C. safety D. danger

3. There are many_____________on the street: cars, buses, bikes, motorbikes…

A. vehicles B. transport C. engines D. machines

4. She spent all day_____________with her children.

A. play B. to play C. played D. playing

5. The central square is______________. It is full of people and noise.

A. quiet B. peaceful C. crowded D. calm

6. Your behaviour is_______________. You should not be rude.

A. disappointing B. disappointed C. disappoint D. disappoints

7. If we walk, we should go on the___________.

A. street B. pavement C. traffic light D. road

8. “One-way street”, “No parking” are___________.

A. road signs B. means of transport C. traffic rules D. mistakes

9. He sings___________. Nobody wants to listen to his voice.

A. bad B. badly C. well D. good

10. He runs___________than me.

A. more faster B. more fastly C. more fast D. faster

2.Fill in each gap with one suitable word:

I live (1)____________Hanoi. It is (2)___________busy city. The streets (3)___________crowded and there are traffic jams in the rush hour. I am sometimes late for school because of the traffic jams. Some people don’t (4)___________the traffic rules. They pass the red traffic light, wear no helmets…Therefore, sometimes there (5)__________accidents. 

Word form:

1. The children were_____________by the stories about ghosts.( FRIGHTEN)

2. It is____________to use gun without permission. (LEGAL)

3. Be____________! A car is coming! (CARE)

4. Have you got______________license? (DRIVE)

5. Stop in front of the zebra______________when the traffic light turns into red.( CROSS)

3.Put question for the underlined part of each sentence:

1. It is 10 kilometers from here to ACB bank.

_______________________________________________________________________________________

2. I have known Marie for nine years.

_______________________________________________________________________________________

3. Yes, they used to be friends at the university.

_______________________________________________________________________________________

4. Sarah left two hours ago.

_______________________________________________________________________________________

5. She is watching Tom and Jerry.

_________________________________________________________________________________

1. A. wished                   B. gripped          C. loved      D. liked

 

2. A. excited B. enjoyed C. bored D. amazed

 

3. A. laughed B. ended C. shocked D. missed

 

4. A. advertised B. murdered C. performed D. approached

 

5. A. produced B. terrified C. entertained D. engaged

6
7 tháng 11 2021

1 .Choose the best answer

1. C

2. B

3. A

4. D

5. C

6. B

7. B

8. A

9. B

10. D

HT ( sai thông cảm )

7 tháng 11 2021

hóa học 7?????? lớp 7 làm gì có Hóa học

7 tháng 11 2021

1.B. enjoys

2.C. bought

3.B. sang

4.D. on

5.A. competition

Minh’s hobby is singing. She (1) ……… singing very much. When her brother (2) ……… a karaoke set last month, Minh was so glad that she (3) ……… every day after dinner. She s to sing only English songs. In fact, she has already sung all the songs found (4) ……… the karaoke discs. Minh is singing in the karaoke (5) ………… organized by the RC Center this Saturday. Her family is going there to support her.

1. A. wants B. enjoys C. thinks D. hates

2. A. invented B. discovered C. bought D. made

3. A. sings B. sang C. sung D. singing

4. A. of B. about C. under D. on

5. A. competition B. battle C. company D. institutio

13 tháng 2 2022

Hợp chất của R với H là RH

Vậy hoá trị thấp nhất của R là I và hoá trị cao nhất của R là \(VIII-I=VII\)

Vậy CTHH Oxit cao nhất của R là \(R_2O_7\)

Ta có \(\%R=38,80\%\)

\(\rightarrow\%R=\frac{2M_R}{2M_R+7.16}=38,80\%\)

\(\rightarrow2M_R=0,388.\left(3M_R+112\right)\)

\(\rightarrow2M_R=0,776.M_R+43,456\)

\(\rightarrow1,224M_R=43,456\)

\(\rightarrow M_R\approx35,5\)

7 tháng 11 2021

cần trợ giúp

14 tháng 11 2021

Gọi số protron ,notron ,electron trong a2b là pa ,na ,ea, pb, nb,eb  ( p,n,e ≠ 0 )

Tổng số hạt mang điện trong hạt nhân nguyên tử của hạt nhân là 54 : pa + p = 54   (1)

Số hạt mang điện trong nguyên tử a gấp 1,1875 lần số hạt mang diện tích trong nguyên tử b : 

2pa -  1.1875 x 2 x pb= 0   (2)    ( pa = ea ; p= eb )  

Từ (1) và (2) ta có phương trình  

pa + pb = 54                                 =>     p= 29

2pa -  1,1875 x 2 x pb =0                       pb = 24

CTHH của a2b là : Cu2Cr