1) Teachers __________ wear suits for work, but their clothes must be neat and clean. a) must b) mustn't c) need d) needn't 2) Students ___________ use their mobile phones during the lessons. a) must b) should c) mustn't d) needn't 3) You ____________ arrive on time for lessons. It's important not to be late. a) shouldn't b) can c) must d) ought'nt 4) You ______________ buy a coursebook, your teacher will give you one. a) needn't b) have to c) mustn't d) cannot 5) That woman _________ be a doctor! She looks far too young. a) can b) can't c) could d) couldn't 6) The museum is free. You __________ pay to get in. a) should b) shouldn't c) have to d) don't have to

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