1. Поставьте mustn't, don't have to или doesn't have to.

1. It's a secret. You mustn't tell it to anyone.
2. She is very rich. She doesn't have to go to work.
3. This party is free. You don't have to buy any tickets.
4. This is the last bus for Paris and we mustn't miss it.
5. We're going to the restaurant, so our mother doesn't have to cook tonight.
6. You mustn't forget to turn off the light before you leave.
7. You mustn't tell me lies. It's just awful.
8. We don't have to tidy up our room because our sister did it yesterday.
9. You mustn't smoke on board the plane.