Fill in can, have to, may, might, must, need or should.
10. You … not vacuum the carpets because Carol has already done it.
11. He … come to my party because he is ill.
12. He … go to the dentist when he has toothache.
13. It's not very important. You … not do it now. You … do it tomorrow.
14. …you speak many languages?
15. I don't know what I'm doing this weekend, but I … go to London.
16. Smoking is very unhealthy. You … stop it.
17. You have got plenty of time. You … not hurry.
18. You … have a passport to visit most foreign countries.