短文改错（共10小题；每小题1分，满分10分）
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，多者（从第11处起）不计分。
In the twenty-first century, pollution has become serious problem to us. It mean that our environment is polluted by waste. He does harm not only to human beings but also to animals. We cannot have fresh air because many factories have the poisonous smoke send into the air. Beautiful parks are made dirty by plastic tins and bag. Fish dead from the polluted water. It is said that strange diseases have been appeared in some places because of pollution. I hoped scientists can find ways to solve this serious problem. We are looking forward to see the clear sky, clean rivers and beautifully parks.