20．网上购物虽然便捷，但个人信息的安全问题不容忽视．（while）While it is convenient to shop online，we can't ignore the safety of our personal information．．

19．这份工作要求太高，没有几个人能胜任．（So…）So demanding/challenging is the job that few people are qualified for it．

18．青年人很有必要学会对自己所做的事情负责．（essential）It's （really/absolutely/fairly） essential that young people （should） learn to be responsible for what they do/are doing/have done或It's （really/absolutely/fairly） essential for young people to learn to be responsible for what they do/are doing/have done．

17．吉姆不假思索地回答了老师的问题．（hesitation）Jim answered his teacher'squestion（s） without （any） hesitation或Jim answered the question（s） asked by his teacher with no hesitation．

16．______ a little money from her pocket money，Alice was able to buy her mother a lovely scarf．（　　）

A．

To save

B．

Saving

C．

Saved

D．

Having saved

15．Judging from the date _______ on the gold coin，we can tell that it was made 500years ago．（　　）

A．

being marked

B．

marked

C．

to mark

D．

to be marked

14．Hard     Charles worked，he wasn't qualified enough for the position of the sales manager．（　　）

A．

although

B．

while

C．

when

D．

as

13．      it was hard for children to leave family and friends，many families chose to send their children to America．（　　）

A．

Because

B．

Although

C．

If

D．

As

12．______ we are aware of the effects that diet products have on us，it is time to seriously think about buying them．（　　）

A．

As far as

B．

Now that

C．

Even though

D．

So long as

11．假如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．
I'mvery glad to have received the letter you sent me two weeks before．I have been thinking about the question you ask me．On my opinion，you should come back after finished your studies abroad．For one reason，that you are studying is badly needed nowadays in our country．It will be quite easily for you to find a good job．In fact，I know a few big company in our city are hoping to hire people like you．For another reason，I think it will be too much more convenient for me to look after your parents as they are getting old．But this is only my point．It is up to you make a right choice．