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.