在学校,一些同学不注意保护学校环境，使学校环境受到了损害。请跟据所给的内容要点以“Keep Our School Clean”为题用英语写一篇80词左右的短文。

内容要点：

1.学校环境越来越差

2.随地吐痰和乱扔垃圾的现象

3.毁坏花草树木

4.多植树，循环使用教材

5.保护学校环境

Keep Our School Clean

保持校园卫生

We are studying in this school. It is our duty to keep it clean and tidy. It is not good to spit in public places, such as in the library, in the class. Eevryone shall protect the grass and not to worlk over on it. We shouldn't leave rubbish here and there. Don't draw pictures on the wall, they influence the look of our school . We should keep the classroom clean and tidy. And we should do some cleaning often. If everyone tries his best to do something useful for our school, I'm sure our school will be more beautiful .