假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号（∧) ,并在其下面写出该加的词。
删除:把多余的词用斜线(\) 划掉。
修改:在错的词下划一横线，并在该词下面写出修改后的词。
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。
Mike is one of my sister's classmate. He is a full-time chemistry student,though at weekends he worked in the university bookshop. She is a member of the Students' Union,and helps holding a few different events. In his free time,he plays an active part in quite a lot clubs and societies. For example,he belongs in the English Club,helping out with many of the organization work. He is also a strongly supporter of the university basketball team. In fact,he's recently been taken on the role of their minibus driver,and takes them to matches once the week.
