题目内容：

假设你是高中生李华，有感于校园中存在的随意涂写( to scribble )和乱丢垃圾( to litter )的行为，请用英语给校长写一封100词左右的信。信中应包括以下内容：

1. 说明写信目的；

2. 对这些行为进行批评；

3. 提出建议。

注意：信的开头、落款及信的第一句已给出，不计入总词数。

July 13, 2018

Dear Mr. Headmaster,

I am Li Hua, a student from Class One, Senior Two.

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Yours faithfully,

Li Hua