短文改错
下面短文中有10处错误。请在有错误的地方增加，删除或修改某个单词。
增加：在缺词处加一个漏词符号（∧），并在其下面写上该加的词。
删除：把多余的词用斜线（﹨）划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
注意：1，每处错误及其修改均仅限一词。
2，只允许修改10处，多者（从第11处起）不计分。
My spare time is full of interested activities. I read all kinds of books in the reading room whenever I am free. I learn much in the library than in class in this way. Meanwhile, I participated in many sports activities, of that my favorite is volleyball. I often play volleyball after the school. Sports and games keep me healthy and energetic enough to get across a variety of difficulties. Sometime I go in for social practice with my classmates outside school. Thus, I can gain much social experiences. Out-of-class activities are quite necessary for our students. Through these activities we can learn many things can not be learned in class.