You mustn't listen to music in the library., Everyone must respect and help their parents., Must children go to school every day?, We must do homework every day., She mustn't ride a bike in a supermarket., They must help their grandparents with the garden., Must a police officer run fast?, Your brother mustn't eat so much chocolate because he is allergic to it., You mustn't run in a swimming pool., You must always wear a crash helmet when you ride your bike,,

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