I:

1: b

2: a

3: c

4: a

5: c

6: b

7; c

8: b

9: c

10: c

II:

1; go

2; went

3: does he go

4: did he go

5: often have

6: often had

7: doesn't go

8: went

9: stops

10: stopped

11: doesn't often drink / likes

12: agrees

13: weren't 

14: has

15: will understand

16: had / kept

17: leaved/ went 

18: received

19: left

20: DID YOU SEE 

21: starts/ finishes

22: bought

23: fell/ broke

24: didn't attend

25: flies/flow

26: does your son go/ goes

27: gets

28: does your father do/ watches/ reads

29: don't go

30: didn't enjoy

31: used to play / was

32: was/had

III:

1: are studying

2: are playing

3: is he driving

4: are listening 

5: isn't studying/ is playing

6: isn't sitting/ is standing

7: is running

8: is doing

9: are they watching

10; are drawing

IV:

1: do -> did-> done

2: write-> wrote-> written

3: be-> was/were-> been

4: drink-> drank-> drunk ( cái này mình thêm nha chứ số 4 ko có dữ kiện )

5: eat -> ate-> eaten

6: lose -> lost -> lost

7: take -> took -> taken

8: ( ko có gợi ý )

9: teach -> taught -> taught

10: begin -> began -> begun