根据提示，请以“School Rules”为题，写一篇短文。
要求：短文字数在60-80之间, 条理清楚，意思连贯，语句通顺，语法正确，书写规范。
提示：
每所学校都有规章制度，下面是你们学校的一些规章制度，请你向一位新生Mary作一下介绍。
内容包括：
1．上课不能迟到。
2．教室要保持(keep)干净和安静。
3．见到老师要问好。（greet)
4．不允许在教室里吃东西。
5．不许在课堂上听音乐，玩游戏。
6．不要损害花草树木。（pick flowers; climb trees）
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School Rules
Welcome to our school, Mary. Here are some of our school rules. Let me tell you: We can't arrive late for class. We can't talk loudly in class. We have to be quiet in class, and we have to keep our class clean. When we meet the teachers on the way, we must greet them. We can't eat or drink in the classroom. But we can eat outside. We can't listen to music or play games in class, either. We can't pick flowers or climb trees.
