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Exercise 9: Complete the sentences with MUST or MUSTN'T.

1. You .................... help your mother with the heavy box.
2. It's very cold. You .................... go out.
3. You .................... look after the house when your parents are away.
4. You .................... wash your face in the morning.
5. You .................... take your umbrella because it's raining.
6. You .................... drink that milk, it's very hot.
7. You .................... make noise in the class.
8. It's dangerous, you .................... touch that wire.
9. You .................... be rude to your teacher.
10. In the class, you .................... study hard.