题目内容
4．Why didn't you do your homework？Students are supposed to do their homework，you know．分析 你为什么不做作业？你知道，学生应该做作业．
解答 答案：supposed．
根据所给首字母提示结合语境推测句意是"你为什么不做作业？你知道，学生应该做作业．"，根据设空处前后的单词结合句意判断设空处缺少supposed，构成短语be supposed to do"应该做某事"，所以答案是：supposed．
点评 做这类题型，首先根据所给单词首字母明确句子所要考查的单词的拼写，再结合相关语法知识对单词做出形式上的变化．
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