1) You _________________ listen carefully. It is important. a) Must b) Mustn't 2) You _________________ use your mobile phones. It is not allowed. a) Must b) Mustn't 3) You _________________ touch the snakes. They are dangerous. a) Must b) Mustn't 4) You ________________ study. The test is tomorrow. a) Must b) Mustn't 5) You _________________ tell us about any problems. We can help you. a) Must b) Mustn't 6) we ______________ go in there. It says ‘No entry’. a) Must b) Mustn't 7) You ____________ turn off the TV before you go to bed a) Must b) Mustn't 8) You ____________ swim in the river. It is dangerous. a) Must b) Mustn't

Must / mustn't

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