My friend Tom stays at Internet bars above 8 hours every day ______, really a netter(网虫).

 A. on average              B. in charge              C. up close                D. for free

  Some people go back to university to__more knowledge after having worked for many years.

A. require              B. inquire         C. acquire               D. request

 Now let me tell you the work I have been doing with them. My job with the UN is not paid, but voluntary and as I said _______, I mainly visit countries where the UN has programs to help people. 

A. before                   B. although              C. even           D. in case

 When she heard that I couldn’t help _____ the problem, the poor girl couldn’t help ____.

A. to solve; crying                           B. solving; to cry

C. solving; crying                           D. to solve; to cry

The kind-hearted woman made _______ her duty to look after all the old people there.

    A. this             B. that              C. one                D. it

  This has made _______ possible for us to catch up with the developed countries. 

A  that                   B  it                     C  us                  D  our country

 More and more foreigners are working in China, ______?

A. are they                   B. aren’t they                C. do they                    D. don’t they

Only when______senior high school_________to show a great interest in poems.

A. did I enter; did I begin                          B. did I enter; I began

C. I entered; I began                                 D. I entered; did I begin

 I’ve heard that we will set out _________ the morning of March 25th .

    A. at               B. in                  C. on                D. over

I’m just wondering ______ I first met Tom.

A. where it was that                              B. that it was where  

C. where was it that                                  D. that was it where