1) We ________ keep quiet in the library. a) must b) mustn't 2) We ________ climb the trees in the garden. a) must b) mustn't 3) We ________ wait for our turns in the computer room. a) must b) mustn't 4) We ________ litter in the classroom. a) must b) mustn't 5) We ________ pick the flowers in the playground. a) must b) mustn't 6) We ________ line up in the corridor. a) must b) mustn't 7) We ________ sit still in the hall. a) must b) mustn't

Must / mustn't

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