20 вставить «must not» или «can not». 1. you go out with your friends if you have homework to do. 2. people hurt animals. 3. you speak during lessons. 4. you run in school corridors. 5. alice mop the floor. she is too small. 6. you cross the road here. it’s very dangerous. 7. you watch tv. it’s not working. 8. you do this exercise. it’s too difficult for you. 9. you lie to your parents. it’s a very bad thing to do.

1. you musn't go out with your friends if you have homework to do. 2. people musn't hurt animals. 3. you musn't speak during lessons. 4. you musn't run in school corridors. 5. alice can't mop the floor. she is too small. 6. you can't cross the road here. it's very dangerous. 7. you can't watch tv. it's not working. 8. you can't do this exercise. it's too difficult for you. 9. you musn't lie to your parents. it's a very bad thing to do.

1)  mustn't 2)  mustn't 3)  mustn't 4)  mustn't 5)  can't 6)  can't 7)  can't 8)  can't 9) mustn't