Card No 21
Put in 'mustn't' or 'don't / doesn't have to':
1) We have a lot of work tomorrow. You -------be late. 2) You -------- tell anyone what I just told you. It's a secret. 3) The museum is free. You --------- pay to get in. 4) Children ------ tell lies. It's very naughty. 5) John's a millionaire. He --------- go to work. 6) I --------- do my washing because my mother does it for me. 7) We --------- rush. We've got plenty of time. 8) You ------------ smoke inside the school. 9) You can borrow my new dress, but you ---------- get it dirty. 10) We ------------ miss the train, because it's the last one tonight. 11) She --------- do this work today, because she can do it tomorrow. 12) I --------- clean the floor today because I cleaned it yesterday. 13) We --------- forget to lock all the doors before we leave. 14) We ---------- stay in a hotel in L.

1. mustn't
2. mustn't
3. don't have to
4. mustn't
5. doesn't have to
6. don't have to
7. don't have to
8. mustn't
9. mustn't
10. mustn't
11. doesn't have to
12. don't have to
13. mustn't
14. don't have to