1) You ....... be quiet during the lesson. a) must b) mustn't 2) Students ...... raise their hand before talking to teacher. a) mustn't b) must 3) You ...... leave the classroom without permission. a) must b) mustn't 4) You ......do your homework on time. a) must b) mustn't 5) You ...... respect and listen to the teacher carefully. a) mustn't b) must 6) You ...... take your friends' stuff without permission. a) mustn't b) must 7) Students ...... eat during the lessons. a) must b) mustn't 8) You ....... use phone during the lesson. a) mustn't b) must 9) You ...... bring your materials to the class. a) mustn't b) must 10) You ....... be carefull while playing with your friends. a) mustn't b) must 11) You ...... wear your mask during the lesson. a) must b) mustn't 12) You ...... wear you school uniforms. a) must b) mustn't 13) You ....... talk with your friends respectfully. a) mustn't b) must 14) Students ...... sit down before the teacher comes to the class. a) must b) mustn't 15) You ....... throw your rubbish on the ground. a) must b) mustn't

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