题目内容：

假定英语课堂上老师要求同桌之间交换修改文章，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。

Last month our class organized a hiking along the Chaobai River, which run through Hebei, Beijing and Tianjin. Much to my disappoint, I found the river was serious polluted. At that moment, I was determined to do what I could protect it. First, under my teacher’s help, I used the equipment from the school lab to test the qualities of the river water. But then, I used the information I had collected it to analyze the pollution of the water. Finally, I write a report on the pollution of the river to the local government. I also gave a speech in class which I suggested that we make small changes to protect our water resources.