One day, space shuttles will travel to Mars      the speed of light.

A. in               B. at               C. with             D. to

      —Are you sure       Tom will come to the party?

—He will when he finishes his work, I think.

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

      Mr. Wang       a comic book for two weeks when he returned to the library.

   A. had borrowed       B. has borrowed       C. had kept              D. has kept

      On the 40^th Earth Day, Dr Wang gave us a talk on the importance of        the earth.

A. practicing               B. preventing               C. polluting                 D. protecting

      —Could you tell me      ?   —Certainly.

A. who is waiting for me                     B. who are you waiting for          

C. what the matter is with your bike            D. how to do

      Tom has much difficulty       Chinese. He often asks me       help.

A. understanding; for   B. understanding; of    C. to understand; for    D. to understand; for

      —Doctor, it seems        you like to work with animals.

   —Yes, I think animals should        as our friends.

   A. that; consider                                            B. that; be considered

   C. what; consider                                          D. what; be considered

             we     up with some other ways to solve this problem?

A. Should; to come       B. Ought; to come       C. Ought; come           D. Should; coming

      A number of visitors        to the Palace Museum. The number of them     10,000.

   A. are attracted; is       B. are attracted; are     C. attracted; is          D. attract; are

      — I’m very tired these days.  —Why not       music? You will feel     .

A. listen to; relaxed                                        B. listening to; relaxing

C. listening to; relax                                       D. listen to; not relax