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Garter Druse ___________ his being selected for the important task to his courage，devotion and knowledge of the area.

A. led 　　　   　B. owed                   C. devoted              D. contributed

---Isn’t it a surprise that I happened to meet Francis Mathews at the Christmas Party last week?

  ---If my memory serves me correctly, you _____ each other for exactly two years.

  A. hadn’t seen       B. haven’t seen        C. didn’t see            D. don’t see

When it    air pollution, Beijing faces the three “C” s-----cars，coal and construction，which lead to Beijing's thick air pollution.

    A. refers to        B. comes to         C. happens to        D. speaks to

 ______ it have been the failure to pick up directions from the ground control that caused the air crash?

  A. Must                 B. Could                  C. Would                  D. Should

The one concern for parents and students is _______ the student pursues their university education in a foreign country, the student will not have the opportunity to establish social contacts in China.

    A. that            B. that if           C. whether          D. how

 After the quarrel, I tried all my best to fix the misunderstanding between us, but all my efforts seemed _____.

  A. in trouble             B. in case                    C. in effect                D. in vain

Failure hurts grown-ups and children___________, but it can make a positive contribution to your life once you learn to use it.

A. actively 　　　 B. likely            C. alike                     D. similarly

If the food tastes nice, I’ll go to buy some more; _______, I won’t go.

  A. if not          B. when not             C. if any             D. when ever

The silence of the library is sometimes broken by a sudden cough or the sound of pages       .

    A. turning                B. turned                   C. being turned             D. having turned

Not until the train pulled into the next station _______ her suitcase gone.

A. Mary had found                        B. had Mary found

C. did Mary find                          D. Mary found