假定你班今天下午要开一次以Keep Our School Clean为主题的英语班会，请以班长的身份准备一篇70词左右的发言稿。

　　提示：不随地吐痰，不乱扔垃圾，不在墙壁上乱涂乱画，每天保持教室内外清洁等(不要逐句翻译)

　　Good afternoon, everyone!

　　We're studying in this school. It's our duty to keep it clean and tidy. It's not polite to spit in public places, such as in the library, in the classroom. We should neither draw pictures on the walls nor throw any litter onto the ground. I think we must make it a rule to do some cleaning every day. If everyone tries his best to do something useful for our school will be more beautiful.

　　That's all. Thank you!

作文题目：Keep our school clean
要求：1 我们是中学生  2  不随地吐痰，不乱扔垃圾  3 不在墙上乱涂乱画
4 每天认真打扫课室内外卫生 
提示：duty（责任） keep clean and tidy, spit(吐痰）throw rubbish make it a rule, do some cleaning , try one's best

Keep our school clean
As we all know,it's very important for us to keep our school clean and tidy,because we are junior students,it's our duty to keep the school clean.However,we can still see that there are many wastes on the ground,such as plastic bags,cans,old batteries and so on.Therefore,we have to protect the environment as soon as possible,such as we can't spit anywhere and we shouldn't throw rubbish anywhere,for it's very rude.We also need to try our best to do some cleaning.In this way,I'm sure that our school will be more and more beautiful in the future.