此题要求改正所给短文中的错误。对标有题号的第一行作出判断：如无错误，在该行右边横线上画一个勾(√)；如有错误（每行只有一个错误），则按下列情况改正：
此行多一个词：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏写符号（∧），在该行右边横线上写出该加的词。
此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
Like many other places, our hometown is either facing              76._____
the problem of pollution. Unfortunately, people there have           77._____
realized the importance of protection the natural environment.        78._____
Factories have been taken measures to stop pouring polluted         79._____
water into the rivers. The citizens no longer put waste, such          80._____
as rubbish or human waste into the rivers. Every year,               81._____
a great number trees are planted. As a result,                      82._____
the water in the rivers are becoming cleaner and cleaner.            83._____
The hills around the city were covered with green trees              84._____
and the air there is much more fresher than before.                 85._____