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。

When I was a child, I hoped to live in the city. I think I would be happy there. Now I am living in a city, but I miss my home in countryside. There the air is clean or the mountains are green. Unfortunately, on the development of industrialization, the environment has been polluted. Lots of studies have been shown that global warming has already become a very seriously problem. The airs we breathe in is getting dirtier and dirtier. Much rare animals are dying out . We must found ways to protect your environment. If we fail to do so ,we'll live to regret it .

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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). 每处错误及其修改仅限一词；

2). 只允许修改10处，多者（从第11处起）不计分。

    Stephen Hawking, the brilliant figure in the modern history of physics, passed away on March 14. He is famous for his work on black holes or relativity. Although he was not able to speak or write, but he published many best-sellers on science, included A Brief History of Time. We admire him not only for that he did, but also for his positive attitude towards life. He even appears in several films and sitcoms as a humorous man. Hawking was great. His dead made many people sad and they said they would learn him. All of us should try his best to live more meaningful.

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。

    Every one of us are thinking about the future.I have decided to become a middle school teacher.Does it sounds surprising?

    I have had this dream when I was a child.I love children.I don't think to deal with them all years round is just wasting time.On contrary, to me it means happiness.Like we all can see, teachers are badly needed in our country, and not many of us want to become teachers.One of the main reason is that teachers work too hard but get too little.In spite of that, I'm determining to devote all my life into the cause of education.

增加： 在缺词处加一个漏字符号(∧), 并在其下写出该加的词。

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： 每处错误及其修改均仅限一词；

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。

    Lily is one of the pupils which are studying in Yangquan Primary School. One day, in her way to school, Lily found the wallet lying on the road. She picked it up and found a lot of money and a calling card in them. She thought the loser must be worried. Without the wallet, she went to a public telephone and called up on the owner. Then she waits at the bus-stop. The owner, an old lady came by taxi in a moment. Lily gave the wallet to her. The owner was very thankful that she took out a 100-yuan notes to reward Lily. But she refused it and went to school. Seeing this, the owner raised her thumb and praised Lily helping her in time again and again.