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。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.

Dear Bill,

I’m glad to receive your letter. Thank you for your caring for the weather or my health. Now I’d like to tell you anything about the smog.

Since last winter, the smog has been occurred a lot of times. It has done great harm to our daily life—a great number people got sick; many traffic accidents happened and quite lots of flights had to be put up. Luckily, people have realized the serious harm causing by the smog and the importance of protecting the environment. People all over the country are taking measure to reduce the smog. As for me, I will go to school by bike or on foot, and I would not throw the waste anywhere. Beside, I will tell people around to try their best to protect the environment. Would you like to tell me some other good ideas?

Looking forward to receive your reply.