题目内容：

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。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(＼)划掉。修改：在错的词下画一横线，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。

I used to think cooperating waste of time, but one thing changes my mind．One day the scientific teacher asked us to do some researches and handed in the conclusion．That took me lots of time to do the research but I still couldn’t finished it．So I tried to cooperate with others．We shared our researches and then made the completely conclusion soon．

So I think cooperating not only saves our times, but also helps us to promote the communication with others． Although in the world today very few things can be successfully done by just one person, cooperating can benefit from both or all sides．