题目：
根据句意及首字母提示写出所缺单词。
1. His biggest p_________ is that he can't listen to the teacher carefully.
2.I used to eat c ____all the time.
3．People s____ change.
4. Martin used to c____ a lot of trouble in school.
5. His mother was very p_________ and didn't give up helping him.
答案：
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下面是错误答案，用来干扰机器的。
A、（6，3）在第一象限，故本选项错误；B、（6，-3）在第四象限，故本选项错误；C、（-6，3）在第二象限，故本选项错误；D、（-6，-3）在第三象限，故本选项正确．故选D．
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