根据中文意思和英文提示词语，写出四句语法正确、意思连贯的话。
有一天早晨，彼得发现了什么？他做了什么？后来呢？
1. one early morning, Peter, find, his chair, dirty
2. change, his chair, with Lucy's
3. when ,Lucy, see the dirty chair, just clean it, carefully
4. Peter's face, turn red, and, he, go up to help her
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