complete the sentences with must,mustn't,can or can't

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complete the sentences with must,mustn't,can or can't
1.don't open your present now in china you ___ wait and open it later .
2.--can i do cleaning at spring festival
--no ,you ___--it's bad luck .
3.in america you ___ open your present immediately .you don't have to wait .
4.in britain you ___ ride your bicycle on the pavement--it's too dangerous .
5.in britain ,you ___ be 18 if you want to drive a car .

1.must
因为第一句说清楚你不能现在打开,然后下一句解释,在中国你“必须”等到之后再打开.
2.mustn't
问题是我可以在春节打扫卫生吗?回答：不可以,那代表坏运气.
这里很坚决地表示反对,用Mustn't.
3.can
在美国你“可以”马上打开你的礼物.can表示可以,能够.
4.can't
不能在人行道上骑车,那不安全.
不需要用Mustn't因为不是那么坚决,而且也没有法律规定,只是劝你不要那样做而已.
5.must
这次因为是法律规定要到18岁才能开车.所以要用Must.

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