modal verbs in negative form:mustn't,don't have to,needn't

Fill in the blanks with mustn’t,  don’t have to / needn’t.

1. Pupils  don’t have to / needn’t   attend the game. It’s optional.
2. You ............................... leave knives in places where babies can get hold of them.
3. We ................................ bring sandwiches. Food will be provided.
4. You ................................. play with that knife! You’ll cut yourself.
5. We ............................... rush. We’ve got plenty of time.
6. If the snow continues, you ........................................ drive that long way.
7. I .................................... pay the phone bill until next week.
8. People ................................ smoke in non-smoking areas.