1) I .... go to school a) must b) mustn't 2) You ... laugh at the lesson a) must b) mustn't 3) I .... feed my parrot a) must b) mustn't 4) You ... tidy your room a) must b) mustn't 5) She .... wear dirty clothes a) must b) mustn't 6) He ... be naughty a) must b) mustn't 7) Children ... be lazy a) must b) mustn't

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