4. Underline the correct item. e.g. You must/mustn't talk during the test. It's against the rules. 21. You must/can't have a party in here. It's not allowed. 22. He must/mustn't park his car here. It's not allowed. 23. He has to/doesn't have to do homework now. We are having holidays. 24. You must/can't wear a seatbelt when you're in a car. That's the law. 25. You have to/needn't go to the library. You must return the book.