He waited ________ the volcano became quiet and he was able to return two days later.

A. when             B. before      C. as         D. until

They held a ceremony ________ those killed in the battle.

A. in honor of   B. instead of      C. in favor of         D. by means of

When the plane arrived, some of the detectives were waiting inside the main building ________others were waiting on the airfield.

A. during  B. where  C. which       D. while

The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.

A. who      B. when      C. on which            D. which

―________ for Beijing?

 ―Yes. And I’ll come back in three months.

A. Have you left     B. Are you leaving

C. Do you leave      D. Did you leave

I haven' t seen Mary these past few days. I m afraid she ____ herself for some time.

A. isn't feeling     B. hasn' t been feeling   

C. hadn't been feeling    D. wasn't feeling

The prices are _____ fast these days. Nobody can get the prices _____.

  A. going down; to bring down        

  B. rising; to be bringing down

  C. raising; bring down

  D. going up; brought down

These winners from that key school are wise and diligent, actually there are ______students in that school

A. many such  B. such many  C. so many  D. so much

___ he was ill, I was expected to take his place greatly surprised me for I didn't have much working experience.

   A. If           B. That if          C. That           D. If that

_______ which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.

   A. Leaving to wonder B. Having left to wonder

   C. Left wondering   D. Left to wonder