题目内容
5．It's not properto push （push） in while others are all waiting for their turn．分析 当别人都在排队的时候插队是不合适的．
解答 答案：to push．根据句意和句子的结构，it在这里做形式主语，那么能联想到让to do sth作为真正主语，构成it is adj to do sth表示做某事是怎么样的，故答案是to push．
点评 看所填单词在句中所充当的成分，看所填单词前面的修饰语，看固定句式或惯用搭配，看句子其他提示词．
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