请修改下面的短文，短文中共有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：在错的词下面画一横线，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。
Like many other places, our hometown is either facing the problem of pollution. Unfortunately, people there have realized the importance of protection the natural environment. Factories have been taken measures to stop pouring polluted water into the rivers. The citizens not longer put waste, such as rubbish or human waste into the rivers. Every year, a great number trees are planted. As a result, the water in the rivers are becoming cleaner and cleaner. The hills around the city were covered with green trees and the air there is much more fresher than before.