1) I .... go to school a) must b) mustn't 2) You ... speak 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 ... help his brother a) must b) mustn't 7) Children ... sleep at night a) must b) mustn't

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