You ____________ eat in the classroom. It isn't allowed. (should/don't have to/mustn't)
mustn't
John _________ wash his hands and change his clothes when he comes home. (shouldn't/must-has to/doesn't have to)
must-has to
You __________ use your mobile phone when you're driving. It's extremely dangerous! (must-have to/mustn't/don't have to)
mustn't
Why are you playing computer games all day? You _________ go out and meet your friends, too. (must-have to/mustn't/should)
should
If you're tired, you ____________ stay up so late. (should/shouldn't/must-have to)
shouldn't
Do I __________ do my homework now, mum? I want to go out! (have to/has to)
have to
How many hours of sleep __________ people get every week? (should/don't have to/mustn't)
should
You ____________ try harder. You can do it! (don't have to/mustn't/should)
should
You __________ go to the party if you don't want to. (should/mustn't/don't have to)
don't have to
Maria _________ take photos here. It is not allowed. (doesn't have to-must-has to/mustn't)
mustn't
Bart____________ dance if he doesn't want to. (doesn't have to/must-has to/should)
doesn't have to
__________ I talk to her? I think she's upset. (Should/Must)
Should
People ____________ mistreat the environment or else it will be too late to save our Earth! (should/shouldn't/must)
shouldn't