Fill in the gaps must, mustn't, have to, don't have to / doesn't have to and the verbs:
visit, touch, go, buy, learn, be polite, walk.
1.l ... to my guests.
2. You. ... her books. She'll be very angry.
3. You. ... me a new bicycle. My old one is very good.
4. You ... your granny. She'll be very happy to see you.
5. I .... to the shop and buy a warm jacket.
6. Mother ... the dog. We always do it.
7. You ... this song by heart. Your teacher won't ask you to sing it.