Only when I left my parents for Italy ______ how much I loved them.

A. I realized               B. I had realized   C. had I realized   D. did I realize

You ______ tell Margaret --- I don’t want her to know about this matter .

   A. can’t   B. mustn’t   C. needn’t   D. shouldn’t

The question _______ we can get enough coal for the winter has not been cleared up yet .

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

It is important that we _______with all that _______ in the struggle.

   A. should unite, be united    B. would unite, can be united

   C. unite , can be united      D. should unite, could unite

_______, my heart ______.

   A. On hearing the sad news, sank      B. Hearing the sad news,   dropped 

   C. At the sad news, fell              D. When I heard the sad news, sank

The boy was too young to _______ right from wrong.

A. realize               B. recognize        C. tell               D. know

Her account made all of us ________ .

   A. to confuse           B. confusing          C. confuse             D. confused

Taiyuan, a city in North China, was struck by a heavy snowfall last week, ______ serious traffic problems.

       A. to face   B. faced       C. having faced         D. facing

 ____, he sometimes makes mistakes.

    A. Though he is careful teacher      B. As he is careful

    C. A careful teacher as he is         D. Being a careful teacher   

—Oh, it’s you! I _____ you.

—I’ve just had my hair cut, and I'm wearing new glasses.

A. didn’t recognize 　  B. hadn’t recognized   

C. haven’t recognized　   D. don’t recognize