Bài 7:

1. volunteer

2. gone

3. helped

4. patients

5. mountainous

6. English classes

7. clean

8. donated

9. homeless

10. save

Bài 8.

1. took

2. arrived, hadn't been

3. said .. had bought

4. taught

5. started ... was

6. donated

7. rang ... invited

8. did you watch

9. was .. used to

10. Did you go...

11. was not .. didn't feel

12. spent

13. wrote ... haven't written

14. Are they

15. saw

16. Have you washes

17. washed ... haven't left

18. have ever eaten

19. Has Susan gone

20. were not

21. Have you done

22. finished

23. haven't seen ... arrived

24. Did you visit

25. have cleaned

26. arrived

27. stayed

28. lost

29. has broken

30. don't see .. saw

31. Has... phoned

32. visited

33. have .. won

34. has gone ... hasn't come

35. visited

Bài 7

1. volunteer 2. gone 3. helped 4. patients 5. mountainous

6. English classes 7. clean 8. donated 9. homeless 10. save

Bài 8

16. Have... washed

17. washed- had

18. have ever eaten

20. weren't

21. Have.... done

22. haven't seen- arrived

23. arrests

24. Did- visit

25. have cleaned

26. arrived

27. stayed

31. Have.... phoned

32. visited

33. have.... won

35. visited

35.