If we don’t take steps, some rare animals, such as the Tibetan antelopes and pandas will ____________ some day just as dinosaur.

A. die out     B. die away       C. die down       D. die off

E-mail, as well as phone calls, _____________ an important part in daily communication.

A. are playing      B. is playing      C. have played       D. has played

When she finished her story, none of us said anything about it, which made her feel rather ________.

A. embarrassing      B. embarrassed        C. embarrass       D. embarrassment

Read the passage a second time, ___________ the meaning won’t become clearer to you.

A. and        B. so         C. or        D. but

------I don’t know why he has made such a silly mistake in the exam.

   ------ He ____________ it before he handed in the paper.

A. may have checked         B. might check

C. must have checked       D. should have checked

________ hard he tried, he could not change his wife’s mind.

A. However       B. Whatever        C. As         D. No matter what

I hated it when people don’t ___________ their promises.

A. carry out      B. look out        C. run out        D. find out

Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.

A. on        B. by        C. in         D. through

In our class there are 60 students, of ____________ two thirds are boys.

A. which       B. them       C. whom          D. who  

---- Where is Jack?

    ----He _________ football on the playground with those AFS students, but I am not sure.

  A. must be playing                  B. must have played   

C. may be playing                    D. may have played