1) You _________________ listen carefully. It is important. a) Must b) Mustn't 2) You _________________ use your mobile phones. It is not permitted. 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 _________________ smoke in a closed place. 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 and there are crocodiles.  a) Must b) Mustn't 9) You ____________ raise you hand to speak in class. a) must b) mustn't 10) You ____________ respect your partners at school.  a) must b) mustn't 11) You ____________ set fire in this area.  a) mustn't b) must 12) You ____________ drive slowly here because there is a hospital.  a) mustn't b) must

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