4. A has worked

   B Started

5. Invited/didn't come

6. began

7. has made

8. Has been

9. Left

Bài 6

1. Have visited

2. has read

3. Haven't begun

4. Has been

5. Haven't started

6. Have been

7. have gone

8. Have explained

9. has taken

10. Hasn't finished

11. haven't seen

12. haven't seen

Bài 7

1. Called

2. Have met

3.have flown/went

4. when did your father give up smoking?

5.moved

6.has been

7.spent

8.have watched

9.delivered

10.heard

11.have had/gave

12has done

13has turned

14has just started

15 has lost

16have gone up

17Have you bought

xin 5*+ctrlhn chúc e học tốt

Exercise 6 : 

1. visited  2. read  3. have not begun  4. been  5.  have not started  6.been  7. went   8. toke  9.  toke 

10.  has not finished  11.have not seen  12.  have not seen

Exercise 7:

1. called  2. met  3. flyed , went  4.  your father given up  5.  moved  6. been  7. spended  8. watched  9. delivered  10. heared  11.  have , gave  12.  done  13.  turned   14. just started  15.  lost  16.  get  17. You buyed  

 Có sai thì mong thông cảm ....

Vì mik mới lớp 5 , nhưng được học tiếng anh lớp 6 rồi.