Choose the correct option: MUSTN'T or DON'T HAVE TO.
1. I DON'T HAVE TO / MUSTN'T take an umbrella. It is sunny.
2. I DON'T HAVE TO / MUSTN'T cross this bridge. It is closed.
3. We DON'T HAVE TO / MUSTN'T be late. The train leaves in 10 minutes.
4. You DON'T HAVE TO / MUSTN'T hurry. We have a lot of time.
5. You MUSTN'T / DON'T HAVE TO touch the decorations. They are not ready.
6. We have many balloons, so we MUSTN'T / DON'T HAVE TO buy more.
7. You DON'T HAVE TO / MUSTN'T come if you don't want to.
8. They MUSTN'T / DON'T HAVE TO wear gloves. It is warm today.
9. You DON'T HAVE TO / MUSTN'T show this email to anyone. It is a secret.
10. The students MUSTN'T / DON'T HAVE TO forget their homework. The teacher will check it at the door.