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