D. Complete the sentences with must or mustn't.

1. You mustn't be quiet in the library.
2. You mustn't go near the fireworks.
3. You must keep your room clean.
4. You mustn't use your mobile phones in the theatre.
5. You mustn't feed animals at the zoo. It's dangerous.
6. You must listen to your parents.
7. You must see the new Spiderman film. It's great!