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。错误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l1处起）不计分。

Our life today has many problems. One of the biggest problems are pollution. Water pollution has made our rivers and lakes dirty. It killed our fish and pollutes our drinking water. Noise pollution makes us to talk louder and become angry more easy. Air pollution is the most serious kind of pollution, that is bad for living things in the world.

We need to do a lot of thing to fight pollution. Factories must clean our waste water before it poured. We can’t throw waste things on the ground. We can go to work by bus and with our friends in a same car. Everybody must help to fight pollution.