假定你班明天下午将召开一次以“Keep our school clean”为主题的班会，请根据以下要点用英语写一篇简短的发言稿。
1、不随地吐痰，不乱扔垃圾。2、不在墙上乱涂乱画。3、坚持每天认真打扫卫生。
注意：1、字数80个单词左右。2、不要逐词翻译。3、开头和结尾已写好。
Good afternoon， everyone！
That's all. Thank you.
Good afternoon, everyone ! I think it is our duty to keep our school clean because everyone likes to study in a beautiful environment. In order to keep our school clean,we should do the following. Don't spit and throw rubbish on the ground. We should use a handkerchief when we want to sneeze. We shouldn't pick up the rubbish and
