假定你是高中生李岳，有感于校园中存在的随意涂写(scribble) 和乱丢垃圾(litter)的行为，请用英文给校长写封信;1. 说明写信的目的 2.对这些行为提出批评 3.提出建议
范文：
Dear Mr. Headmaster,
I am Li Yue , a student from class one ,senior II . I am writing to draw your attention to some improper behavior among us students : littering and scribbling . It makes our school dirty and unpleasant , and does harm to the image of our school . I always feel ashamed whenever I see this . It is clearly not appropriate for a student to litter and scribble about. I wonder if the school could place more dustbins around and set up specific rules against such behavior. At the same time , students should be encouraged to develop good habits and better behave themselves. I believe that , with the joint efforts of bother teachers and students ,our school will become a more enjoyable place in the near future. Thank for your consideration.
Yours faithfully,
Li yue