1) We ______ do our homework. a) must b) mustn't 2) We_____eat and drink in the classroom. a) must b) mustn't 3) We____use mobile pnones at school. a) must b) mustn't 4) We____wash oor hands before class. a) must b) mustn't 5) We_____listen to music in the classroom a) must b) mustn't 6) We____be quiet in the library. a) must b) mustn't

School Rules. must/mustn't

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