题型：翻译 题类：常考题 难易度：困难
仁爱科普版九年级上Unit 4 Amazing Science Topic 1 When was it invented?同步练习1
In general, a naughty child has many .
When you failed, don't .
Before you start to work, you should make a .
Waiting may be a of problem.
Doing in order to evaluate this .
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