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。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(＼)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。

This summer, I paid a visit in my hometown. What made me really sad was that it had changed a lot of.

In the past, my hometown was very beautiful, with small river run through the village. Tall and straight trees, beautiful flowers or green grass could be seen everywhere. Nowadays, therefore, with the development of modern society, people are living a “happy” life. Many tall buildings are found on both sides of the river, but the river has been bad polluted as waste water runs directly into it and there are now few fishes swim in it. It was time to take measure to protect our living environment.