A. Use must or mustn't.

A. Use must or mustn't.

1. You mustn't go out. It is raining heavily.
2. Your room is untidy. You must do it.
3. Jane, you're ill. You must stay in bed.
4. Bob has a high temperature. He must go to school.
5. It's eleven o'clock. Betty must go to bed.
6. Jill has a bad tooth. She mustn't eat much chocolate.
7. You mustn't play in the street. It's dangerous.