a.
2 should
3 must
4 must / have to
5 don't have to
6 don't have to
7 should
8 mustn't
9 shouldn't
10 must / should
b.
2. You should have a rest.
3. Everyone will have to speak.
4. v
5. I had to stay in bed.
6. You mustn't park
7. v
8. People shouldn't answer
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