Question

根据所给的句子，仿照例句用must或mustn't造句。

e.g.  Never swim in the waterfall.
       You mustn't swim in the waterfall. 
1. Never speak loudly in the library. 
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2. Never sleep outside at night in winter. 
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3. Don't play with fire. 
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4. Always do warm-up exercises before running.
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5. Always wear sports shoes on Sports Day.
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Answer 1

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.