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。
One Sunday morning, Jack and I go fishing on a river. In our surprise, we found the water was very dirty and smelly that we couldn’t see the river bed at all. We also found some rubbish or dead fish floating on the river. That afternoon, we caught only one small fish, that seemed ill. Most fish in the river were dead. Why? That is because of the chemical factories along the river are always pouring its waste water and rubbish into the river, making the water polluting seriously. Therefore, it is difficult for us see fish alive in the river. I think some measure must be taken to stop the pollution.