His success was due to ________ he had been working hard.

A. what                        B. the fact which           C. the fact that           D. the fact

David decided not to work on the program in the office because she didn’t want her boss to know what she __________.

A. was doing                B. is doing                       C. has done               D. had done

America has more than fifty states, ______, Kentucky, is the place _______ Abraham Lincoln was born.

A. one of it; where        B. one of which; where

C. one of that; which     D. one of which; which

We are looking forward to ______ another chance ______ it again.

A. be given; to try          B. give; to try                C. giving; trying         D. having; to try

 ―Most people think the rabbit is a beautiful, gentle animal which can run very fast.

―_____________.

A. So does it                 B. So it does                 C. So it is                     D. So is it

--I want to know if I _______ smoke here.

--No, you _______. Couldn’t you see the sign "NO SMOKING" there?

A. can; needn't             B. must; can't              C . may; mustn't       D. shall; won't

I’ll leave Changsha for Beijing ______ a week, while my brother will leave Beijing for Changsha ______ our National Day.

A. in; in                       B. after; in                   C. after; after             D. in; after

 I rang up my parents and then grandparents last night. To my disappointment,        of them answered it.

A. either                       B. none                            C. neither                  D. all

 ______ your composition carefully, some spelling mistakes can be avoided.

A. Having checked             B. If you check          C. Check                    D. To check

______ March 12th, the students were planting trees on the hill.

A. There being　　        B. It was　                   C. It being　　           D. This was