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。短文中有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（Λ），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11处起）不计分。
Recently we have a hot discussion on if people should keep pets at home in cities or not.                             
Some students think it is a good idea to keep pets because of many old people living alone can get
comfort from them. Beside, getting along well with animals will make our life interested. On the
other hand, other students are against the idea. In their opinions, if too many people keep pets at
home, it’s bad to the environment. What is worse, pets may make too much noisy and even attack
people. I like animals, but I don’t think it bad to keep pets at home. But we must take measures to
keep them polluting our environment.