1. can, should 2. might 3. must 4. can 5. has to 6. can't 7. could 8. mustn't 9. had to 10. needn't 11. mustn't 12. needn't 13. cannot 14. mustn't 15. had to 16. could 17. shouldn't 18. should 19. ought not to 20. should 21. may 22. should 23. mustn't 24. shouldn't
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Verified answer
1. can, should2. might
3. must
4. can
5. has to
6. can't
7. could
8. mustn't
9. had to
10. needn't
11. mustn't
12. needn't
13. cannot
14. mustn't
15. had to
16. could
17. shouldn't
18. should
19. ought not to
20. should
21. may
22. should
23. mustn't
24. shouldn't