题目内容：
短文改错
Recently, my classmates have had a hea
ted discussion about if we should have optional courses(选修课) in high schools. Some students werein favor of optional courses. They say interest is best
teacher andour spare time will be colorful and meaningful. Students can not onlyenlarge 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. Besides, 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 optional courses. I'd like to take one or twoof the optional courses, which, I think, will certain
benefit me lot.
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