按要求写一篇英语作文~急求！需要原创，不要网上的！谢谢，好的追加分！

This is a story that happened in a school campus. One day, after school was over Peter was taking a walk in the school campus, singing very happily. When he passed by a water tap, he found that water was still running. Someone forgot to turn it off! Although it was the easiest thing for him to turn it off, and he should have done so, he seemed not to have noticed it and went on walking as if nothing was happening there.
Just then，Mary was passing by and noticed that.“Who led the water running after using it?”she thought to herself. She rushed to the tap and turned it off as quirkily as possible. When Mary was doing that, Peter was right there, standing beside her with a cold look. Mary turned to him and scolded him for not having turned off the tap. “It is none of your business!” Peter said coldly, “Beside, it was not I who had turned it on.” Hearing this, Mary was very disappointed and she was at a great loss……

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