Keep Our School Clean写一篇英文发言稿

Everybody likes to study in a beautiful and clean school so it is our duty to keep our school clean and tidy.We shouldn't spit on the ground.We shouldn't throw the litter and we should put it into the dustbin.We should keep the walls clean so please don't draw or write on them.We should clean the classroom and the playground carefully every day.If everyone makes a contribution to protecting our school environment,I am sure our school will be cleaner and more beautiful.