1) I .... go to school. a) must b) mustn't 2) You ... sing 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 ... put his feet on the desk. a) must b) mustn't 7) Children ...  eat a lot of sweets. a) must b) mustn't

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