1) You _____ water the plants.  a) must b) mustn't 2) We ____ talk in the lesson. a) must b) mustn't 3) You _____ eat too much fast food. a) must b) mustn't 4) You are sick. You ______ stay in bed. a) must b) mustn't 5) You are sick. You _____ take pills. a) must b) mustn't 6) You _____ be late for lessons. a) must b) mustn't 7) You ______ visit your dentist regularly. a) must b) mustn't 8) It's 11 o'clock at night. You ______ play loud music. a) must b) mustn't 9) You ______ clean your room. a) must b) mustn't 10) You have a cold. You _____ take a syrup. a) must b) mustn't 11) You ___________ smoke at school. a) must b) mustn't 12) I ___________ feed my dog. a) must b) mustn't 13) My sister _____________ do the ironing. a) mustn't b) must

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