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You.................... open this door! there is a dog!
mustn't
The match isn't free to watch. We................buy the tickets.
must
To be a doctor you................go to medical school.
must
You.............use your mobile phone in class.
mustn't
Students ___________do their HW.
must
You ____________ chew gum in class
mustn't
You _____________ make so much noise.
mustn't
You ___________ listen to your friends when they are speaking.
must
You __________ keep quiet in a museum.
must
You __________ wear a helmet when you ride a bike.
must
I ___________ use my camera here. The sign says no photos.
mustn't
I ____________ drink water from the lake. It is dirty.
mustn't
I ____________ take off my shoes in the house.
must
