根据所给的句子，仿照例句用must或mustn't造句。e.g. Neverswiminthewaterfall.
Youmustn'tswiminthewaterfall.
1.Neverspeakloudlyinthelibrary.
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2.Neversleepoutsideatnightinwinter.
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3. Don'tplaywithfire.
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4. Alwaysdowarm-upexercisesbeforerunning.
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5. AlwayswearsportsshoesonSportsDay.
________________________________________________1. You mustn't speak loudly in the library.
2. You mustn't sleep outside at night in winter.
3. You mustn't play with fire.
4. You must do warm-up exercises before running.
5. You must wear sports shoes on Sports Day.