10. Complete each of the gaps
1. needn't have revised
2. didn't need to pay
3. don't need to
4. mustn't tell
5. shouldn't have
6, needn't buy
7, don't need to worry
8, didn't have to go
11. Supply the correct form of the verb
1. must wear
2. should have been invited
3. can be solved
4. have to be finished
5. must be warned
6. will have to be finished
7. must be done
8. should have brought
9. must be stolen
10. mustn't be taken
11. washing
12. should have locked
13. don't need to cut
14. can be exchanged
15. must be playing
16. must have been made
17. shouldn't have been
18. shouldn't be kept
19. don't need to water
20. shouldn't have watered
