70. A

1.     He has worked at the grocery store for 5 years.

He started working at the grocery store 5 years ago.

2.     He has waited this news for a long time.

He began waiting this news a long time ago.

25. has worked

26. was raining

27. will living

28. is visited

29. was broken

30. was sent

Câu 17.C

III. Complete the sentences with the present simple or present continuous form.

1. He (come) comes from Da Nang.

2. Do you study English? No, I (do not) don't.

3. I (do) do my homework after school.

4. Mr An (teach) teaches physics.

5. Phong often (play) plays football at the weekend.

6. We (visit) are visiting our grandparents now.

7. They (not go) don't go to work on Saturdays and Sundays.

8. They (watch) are watching TV at home right now

9. Does my grandfather(read) read newspaper everyday?.

10Does Mary (have) have short hair?

11.She (walk) walks to school with her friends everyday.

12.My sister (be) is   a teacher.

13.I (do) am doing  my Math homework at the moment.

14.Let‟s (go) go to the English club.

15. We (speak) are speaking French at the moment.

16. Look at the girl! She (ride) is riding a horse.

19.Minh sometimes (practise) practises the guitar in his room.

20.Do you (like) like chocolate ice cream?

1. likes

2. enjoy

3. welcomed

4. doesn't like

5. works

6. eat - sing

7. don't have 

8. make

9. eat - light 

10. decorate - get 

11. clean

12. does

13. don't like

14. doesn't like

15. to go

16. watch

17. plays - gets

18. starts - ends

19. is - need

20. to eat

a)  Cho hàm số y = f(x) = -2x + 3.

Ta có: f(-2)= -2.(-2)+3

                 = 4+3=7

Ta có: f(0)= -2.0+3

                = 0+3=3

Ta có: f()= -2.(-\(\dfrac{1}{2}\))+3

                    =\(\dfrac{-2.\left(-1\right)}{2}\)+3

                    =\(\dfrac{2}{2}\)+3

                    = 1+3= 4

Vậy  f(-2)=7;f(0)=3;f( \(\dfrac{-1}{2}\))=4

b) Cho hàm số y = f(x) = -2x + 3

     mà f(x)=5

     Suy ra:        f(x) = -2x + 3=5

     hay              -2x + 3=5

                         -2x=5-3

                         -2x=2

                          x=2:(-2)

                          x= -1

         Cho hàm số y = f(x) = -2x + 3

               mà f(x)=1

              Suy ra:        f(x) = -2x + 3=1

                hay              -2x + 3=1

                                    -2x=1-3

                                    -2x= -2

                                    x= -2:(-2)

                                    x=1

       Vậy f(x)=5 thì x= -1 và f(x) = 1 thì x=1.

1.      Lan didn’t go to school because she was sick.

->  Lan was sick, so she didn't go to school.

2.We think that learning English is interesting.

-> We find learning English interesting.

3.      He likes playing soccer very much. 

-> His hobby is playing soccer.

4.      Yesterday my parents sent me a letter.

-> Yesterday I was sent a letter by my parents. 

5.      I didn’t go to school because I was tired.

-> I was tired,  so I didn’t go to school. 

6.      It will be good if you eat less meat and more vegetables..

-> You should eat less meat and more vegetables.

7.      He likes playing computer games in his free time.

-> His hobby is playing computer games.

8.      I am interested in watching TV in the evening.

->  I enjoy watching TV in the evening.

9.      He thinks that learning English is important.

-> He finds learning English important.

10.   People grow coffee in Brazil.

-> Coffee is growed in Brazil.

11.   I started playing soccer 5 years ago.

->  I have played soccer 5 years ago.

12.   He eats two apples. Lan eats two apples.

-> He eats two apples and Lan does too.

13.   Minh doesn’t eat two apples. Lan doesn’t eat two apples.

->Minh doesn’t eat two apples and Lan doesn’t either.

14.   This film is more interesting than that film.

-> That film isn’t so interesting as this film.

15.   Nam played football in the stadium yesterday.

-> Football was played in the stadium by Nam yesterday.

16.   What hobby do you like best, Mai?

-> What is your favourite hobby, Mai?

17.   Charles Dickens’ novels attract a lot of children.

-> A lot of children are attacted by Charles Dickens’ novels.

18.   Her book is not the same as mine.

 -> Her book is different from mine.

19.   The police questioned everybody in the house.

 -> Everybody was questioned in the house by the police.

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