We may never discover what ______ that night when you left for Beijing.

The boss usually go to work by bike _____ it rains.

In the school, some fans even don’t know the _____ of jazz.

--Excuse me where is the bus station?

--Sorry, I am a newcomer.

--_____

A. What a shame.           B. Thanks anyway.

C. It doesn’t matter.    D. Why not buy one?

 --Sorry to bother you.

--_____ You didn’t mean to, did you?

Although I admire you _____ your work on soil, I think you should apologize the villagers for the water pollution.

My mother couldn’t go to school, _____ being poor, the family couldn’t pay for his education.

With a lot of homework _____, I decided not to play with you.

A. to do                     B. doing                        C. done                         D. being done

After a long discussion, the experts finally _____ up with suggestions for solving the air pollution.

His determination and devotion to science _____ the great discovery.