3. Complete with 'must' or 'mustn't'.
1. You ... do your homework every day.
2. You ... be rude to your parents.
3. You ... worry about the exam.
4. We ... buy some flowers for the party.
5. You ... drink too much coffee.
6. You ... drive fast.
7. You ... drink a cup of milk every day.
8. You ... exercise three times a week.
9. You ... eat too many sweets.
10. You ... clean your teeth every day.

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