下文中共有十处错误，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∧)，并在此符号下面写出该加的词。

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、只允许修改十处，多者(从第11处起)不计分。

Dear Wang Ping，

I’m very glad to have received a letter you sent me two weeks before．I’ve been thinking about the question you ask me．In my opinion，you should come back after you finish your studies at abroad．For one reason，what you are studying is bad needed nowadays in China．It will be quite easy of you to find a good job．In fact，I know that a few big company in our city are hoping to hire people like you．For other reason，I think it will be much more convenient for you to look after your parents as we are getting old．Therefore，I think it’s a good idea for you to return．So what are you waiting?

Best wishes．

Yours，

Li Hua

物体在合外力作用下做直线运动的v-t图象如图所示．下列表述正确的是（　　）

A．在0-1s内，合外力做正功

B．在1-2s内，合外力做负功

C．在1-3s内，合外力不做功

D．在0-3s内，合外力总是做正功