写一篇英语作文假定你们班今天下午要开一次以“Keep School Clean”为主题的英语班会,请你以班长的身份准备一

Good afternoon,everyone!
We are studying in this school.It's our duty to keep it clean and tidy.It's not good to spit in public places,such as in the library,in the classroom and so on.We should neither draw pictures on the wall nor throw any