Choose the correct word

1. You must/ought to be very tired. Do you want to sleep for a while?
2. I have to/could go to the bank. I`m out of money.
3. She mustn`t/needn`t drop litter here. It`s forbidden.
4. Could/Would you like a cup of a hot milk?
5. There are many heavy things in my bag. May/Can you carry it?
6. It`s necessary to reduce waste, that`s why we may/have to do it.
7. You should/may be right.
8. It`s Saturday tomorrow. You mayn`t/don’t have to wake up early.
9. Young people ought to/can respect the elderly.
10. You have to/can go now if you want to.
11. That can`t / mustn`t be his mother. She looks young.
12. If we act now, coral reefs need/may survive.
13.Can/ Need you help me?
14. Could/Should you tell me how to get to the museum?