因为后面是was，故应改为lunch。

　　本短文用的是过去式，故改为was.

　　none作为先行词，关系代词为that。

　　angry为形容词，angrily 为副词，修饰动词。

　　walked与前面的ran并列。

　　前面没有提起房间，故改为a。

　　it指代the lunch box，是单数。

　　打开盒子后，才会发现…。

　　Dear Editor,

　　Recently, my classmates have had a heated discussion about that

　　we should have optional courses in high schools. Some students were

　　in favor of optional courses. They say interest is best teacher

　　and our spare time will be colorful and meaningful. Students

　　can not only enlarge their knowledges but also improve their abilities.

　　However, others are against the idea, said that optional courses

　　will take up too much time as well as energy. In addition to, some optional

　　courses have something to do with the College Entrance Examination. They

　　are afraid they’ll fall behind their classmates if they will take the

　　optional courses. I’d like to take one or two of the optional courses, which, I think, will certain benefit me a lot.

　　Yours truly,

　　Li Hua

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