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