Insert ‘mustn’t’ or ‘can’t’. 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.