1) You ______________ shout. a) must b) mustn't 2) You ______________ do homework. a) must b) mustn't 3) You ______________ listen to the teacher. a) must b) mustn't 4) You ______________ eat in the classroom. a) must b) mustn't 5) You ______________ talk on the mobile. a) must b) mustn't 6) You ______________ clean the board. a) must b) mustn't 7) You ______________ draw on the desk. a) must b) mustn't 8) You ______________ sit still in the lesson. a) must b) mustn't 9) You ______________ drink cola in the lesson. a) must b) mustn't 10) You ______________ sit on the desk. a) must b) mustn't 11) You ______________ be a good friend. a) must b) mustn't 12) You ______________ stand on the chair. a) must b) mustn't 13) You ______________ wash your hands. a) must b) mustn't 14) You ______________ read books. a) must b) mustn't 15) You ______________ be happy. a) must b) mustn't 16) You ______________ run in the corridor. a) must b) mustn't 17) You ______________ forget your notebook. a) must b) mustn't 18) You ______________ play football in the classroom. a) must b) mustn't

Must / Mustn't

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