1 b) had to
2 b) are to
3 a) must
4 c) should
5 c) should
6 a)don't have to
7 a) must not
8 a) needn't
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1 b) had to
2 b) are to
3 a) must
4 c) should
5 c) should
6 a)don't have to
7 a) must not
8 a) needn't