1 Children now spend much more time on the internet than watching television
2 There are a lot of interesting programmes on Disney Channel
3 I am really bored when I watch documentaries
4 I enjoy watching game shows or films
5 Children shouldn't spend too much time watching television
6 Many people work hard every day to produce TV programmes
7 You should do your homework instead of watching TV before dinner

ex 3:
1 My father usually helps me to learn English
2 He was heard to shout
3 This student expected to be the first winner of the Grand Prix
4 I told her not to worry about her wedding; everything will straighten out
5 May I suggest you let Mary do so
6 She pretended not to hear him when he called her
7 The doctor advised me not to stay up late
8 The school superintendent told me to hurry up
9 "Let us face the enemies," shouted the soldiers
10 Mr. Brown told the schoolgirls not to eat in class
11 I have heard Dang Thai Son play the piano
12 The young teachers wanted a Foreign Language Teaching workshop to be held in Ho Chi Minh City
13 In order to be able to take part in the international math contest two years from now, Son works very hard in his math class
14 Try not to make so many mistakes
15 Let me hear from you soon
16 John is too stupid to understand this
17 The wind is strong enough to blow the roof off
18 My father is too tired to stay up late
19 John wanted me to help him
20 I want to leave early tomorrow morning

MẠO TỪ
1 I would like to live by the sea
2 Harry is a sailor. He spends most of his life at sea
3 There are billions of stars in space
4 He tried to park his car but the space wasn't big enough
5 We often watch television
6 Can you turn off the television, please
7 We had a dinner in a restaurant
8 We had a meal in a restaurant
9 Thank you. That was a very nice lunch
10 Where can people buy everything they need
11 Her parents are now working in Europe
12 He majors in English
13 Mark Twain, an American writer, wrote "Life on the Mississippi River
14 Paris is splendid by night
15 We might be able to catch the last train if we hurried
16 A used razor blade is a useless thing
17 We live at the third house from the church
18 My aunt has an interesting novel
19 It was the best film I had ever read
20 A video lab is a useful means for language learning
21 We often watch television in the evening
22 We had a wonderful trip last summer
23 Where can people buy everything they need
24 Her parents are now working in the countryside
25 We live at the third house from the church
26 My aunt has an interesting novel
27 It was the best film I had ever read
28 My parents have a cat and a dog. The dog never bites the cat
29 We live in a big house in the middle of the village
30 It was a beautiful day; the sun shone brightly in the sky

GIỚI TỪ
1 I often go to school by bus
2 Their grandparents live at 34 Hang Da street
3 Bob and I come from the same town, but my accent is different from his
4 At present, John is staying with his brother’s family in the city center, very far from his parents
5 Thanh is a newcomer in class 7D. She sits next to my cousin
6 We often go to the concert on weekends
7 Are you free this Sunday at 9 o’clock
8 I want to send to my friend this package
9 Daisy gives two stamped envelopes to Mary
10 The students are waiting for their teachers over there
11 The weather is usually hot in summe
12 Viet lives with his aunt and uncle at 83 Hoang Van Thu street
13 Our party will be from ten o’clock to half past eleven in the morning on Sunday
14 What’s your place of birth, Nam
15 Trung will have a party for his birthday at home
16 I’ll wait for you outside the school gate
17 Don’t speak to her now. She is not feeling very well
18 If you write for me a song, I will sing it at the school concert
19 I am afraid I am not very good at English
20 Will it be convenient for you to see me tomorrow
21 We are going to treat you with a different kind of drug which we hope will be more successful
22 Her birthday is on October 17th

ex 2:
1 She was very surprised at the grade she received
2 We might need more food, depending on how many people turn up
3 Jane doesn't spend much money on clothes
4 She always takes good care of her children
5 A sign warned motorists of dangers
6 They translated the letter into French
7 I was disappointed with the grade I received on my last essay
8 The medical center is close to campus
9 We went there by car and stayed there for the whole day
10 We started our journey on foot
11 He always prevents me from doing my duty
12 I write letters with my right hand
13 The war victims suffered terribly from cold and hunger
14 She is absent from class
15 It is very nice of you to take so much trouble
16 You may write with pencil
17 He congratulated me on winning the competition
18 Remember me to your parents
19 Mr. Foster lives at 667E 76th street in New York
20 We reached her house safe and sound

\(a.\dfrac{31}{17}+\left(-\dfrac{5}{13}\right)+\left(-\dfrac{8}{13}\right)-\dfrac{4}{17}\\ =\left(\dfrac{31}{17}-\dfrac{4}{17}\right)+\left(\dfrac{-5}{13}+\dfrac{-8}{13}\right)\\ =\dfrac{27}{17}+\left(-1\right)\\ =\dfrac{27}{17}+\dfrac{-17}{17}=\dfrac{10}{17}\\ b.\left(-2\right)^3-1=-8-1=-9\\ \dfrac{5}{27}\cdot\left(\dfrac{-3}{2}\right)^3=\dfrac{5}{27}\cdot\dfrac{-27}{8}=-\dfrac{5}{8}\)

729 số

1 Jane likes to wear colourful clothes
2 He is a good student
3 We must be quick. We have little time
4 She acted too badly
5 Nam speaks English fluently
6 I am terribly sorry. I am late
7 He feels happy in his new club
8 I tried on my shoes and they fitted me perfectly
9 It's extremely cold
10 It's kind of you to help me

1 The judge convinced that the man was (to be) guilty
2 My father does not like (not like) skiing
3 Three days are not (not to be) long enough for a good holiday
4 They may use (use) this room for the classroom
5 You must clean the wall before you paint (paint) it
6 The audience listened (listen) to everything he said last night
7 Sometimes she gets up before the sun rises (rise)
8 They are preparing (prepare) the Christmas dinner at the moment
9 He worked (work) in a bank when he lived in London
10 We will start (start) our plan next week

1 Some programs on TV are becoming very popular with children
2 The earth is getting warmer and warmer
3 Clair is very sociable. She knows a lot of people
4 She spent her childhood in the country
5 I am an energetic person. I play a lot of sports and run every day
6 There is a beautiful bridge in the city centre
7 The president will make a speech tonight
8 Her parents encouraged her to apply for the job
9 I understand clearly what you are saying
10 Artists are creative people

bài 1

\(a.\dfrac{1}{10}-\left(-\dfrac{1}{12}\right)+\dfrac{1}{15}\\ =\dfrac{1}{10}+\dfrac{1}{12}+\dfrac{1}{15}\\ =\dfrac{6}{60}+\dfrac{5}{60}+\dfrac{4}{60}\\ =\dfrac{15}{60}=\dfrac{1}{4}\\ b.\dfrac{-5}{3}+\dfrac{1}{2}:\dfrac{3}{4}\\ =-\dfrac{5}{3}+\dfrac{2}{3}=-1\\ c.\dfrac{2}{3}+\dfrac{1}{3}\cdot\left(-\dfrac{4}{9}+\dfrac{-5}{6}\right):\dfrac{7}{12}\\ =\dfrac{2}{3}+\dfrac{1}{3}\cdot\left(-\dfrac{23}{18}\right):\dfrac{7}{12}\\ =\dfrac{2}{3}+\dfrac{1}{3}\cdot\left(-\dfrac{23}{18}\right)\cdot\dfrac{12}{7}\\ =\dfrac{2}{3}+\dfrac{-43}{63}=-\dfrac{4}{63}\)

\(d.\left(2+\dfrac{5}{6}\right):\dfrac{6}{5}-\dfrac{7}{12}\\ =\dfrac{17}{6}:\dfrac{6}{5}-\dfrac{7}{12}\\ =\dfrac{17}{6}\cdot\dfrac{5}{6}-\dfrac{7}{12}\\ =\dfrac{85}{36}-\dfrac{7}{12}=\dfrac{16}{9}\)

bài 2:

\(a.\left[\dfrac{21}{31}+\left(-\dfrac{16}{7}\right)\right]+\left(\dfrac{44}{53}+\dfrac{10}{31}\right)+\dfrac{9}{53}\\ =\dfrac{21}{31}-\dfrac{16}{7}+\dfrac{44}{53}+\dfrac{10}{31}+\dfrac{9}{53}\\ =\left(\dfrac{21}{31}+\dfrac{10}{31}\right)+\left(\dfrac{44}{53}+\dfrac{9}{53}\right)-\dfrac{16}{7}\\ =1+1-\dfrac{16}{7}=-\dfrac{2}{7}\\ b.\dfrac{34}{5}-\left(\dfrac{5}{6}+\dfrac{19}{5}\right)\\ =\dfrac{34}{5}-\dfrac{139}{30}=\dfrac{13}{6}\\ c.\dfrac{28}{9}\cdot\dfrac{89}{7}-\dfrac{68}{7}\cdot\dfrac{28}{9}\\ =\dfrac{28}{9}\cdot\left(\dfrac{89}{7}-\dfrac{68}{7}\right)\\ =\dfrac{28}{9}\cdot3=\dfrac{28}{3}\\ d.\dfrac{-3}{5}\cdot\dfrac{5}{7}+\dfrac{3}{-5}\cdot\dfrac{3}{7}+\dfrac{3}{5}\cdot\dfrac{-6}{7}\\ =\dfrac{-3}{5}\cdot\dfrac{5}{7}+\dfrac{-3}{5}\cdot\dfrac{3}{7}+\dfrac{-3}{5}\cdot\dfrac{6}{7}\\ =\dfrac{-3}{5}\cdot\left(\dfrac{5}{7}+\dfrac{3}{7}+\dfrac{6}{7}\right)\\ =\dfrac{-3}{5}\cdot2=-\dfrac{6}{5}\\ e.\dfrac{3}{13}:\left(\dfrac{-11}{-6}\right)+\dfrac{-3}{13}:\dfrac{11}{-5}-\dfrac{2}{13}\\ \dfrac{3}{13}\cdot\dfrac{6}{11}+\dfrac{3}{13}\cdot\dfrac{5}{11}-\dfrac{2}{13}\\ =\dfrac{3}{13}\cdot\left(\dfrac{6}{11}+\dfrac{5}{11}\right)-\dfrac{2}{13}\\ =\dfrac{3}{13}\cdot1-\dfrac{2}{13}=\dfrac{1}{13}\)

\(18=\dfrac{x+\left(x+2\right)+\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+\left(x+10\right)+\left(x+12\right)}{7}\\ 18=\dfrac{7x+42}{7}\\ \Rightarrow126=7x+42\\ \Rightarrow18=x+6\\ \Rightarrow x=12\)

vậy 7 số chẵn liên tiếp đó là: \(12;14;16;18;20;22;24\)

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