We are studying in our beautiful school. It's our duty to keep our school yard clean and tidy. It's not good to spit in a public place, such as in the library, in the classroom and our computer rooms .We should neither draw pictures on the wall nor throw any litter onto the ground.I think we must make it a rule to do some cleaning every day in and out of classroom.Now it's hot in summer.Every one of us should have a good habit of health.If every tries his best to do something useful for our school,I'm sure our school will become more and more beautiful.