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11. C) mustn't
12. A) mustn't
13. B) should
14. C) has to
15. C) mustn't
16. D) must
17. B) mustn't
18. A) has to
19. B) mustn't
20. A) have to
21. B) mustn't

SUBST
22. B) mustn't
23. B) mustn't
24. C) mustn't
25. B) mustn't
26. A) mustn't, must
27. C) mustn't
28. D) must
29. A) has to
30. D) must
31. D) mustn't