— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.  

— Oh, dear ! She ______ a lot of difficulties !

A. may go through                  B. might go through

C. ought to have gone through         D. must have gone through

— I’ve taken someone else’s green sweater by mistake.

— It ______ Harry’s. He always wears green.

A. has to be        B. will be          C. mustn’t be          D. could be

He hesitated for a moment before kicking the ball, otherwise he ____ a goal.

A. had scored                       B. scored

C. would score                      D. would have scored

_____, experts point out that students can easily fail at starting their business because of a lack of preparations.

   A.But                B.However           C. while             D.though

The students shouldn’t only be judged_____ how good their remarks were in the exam.in order to start their own business

   A. in terms of          B. in term of          C. to terms of        D. on term of

20. Is Mr. Wang good at drawing his students into ______   

  discussion?

  A. lovely      B. lively   

C. warmly     D. seriously

6. —No wonder you caught a cold. You______out last night without a coat.

—I know how silly I was.

A. shouldn’t have gone   

B. mustn’t have gone

C. couldn’t have gone

D. mightn’t have gone

18. After the new technique was introduced the factory produced      cars in 1994 as the year before.

A. as twice many     B. as many twice

C. twice as many     D. twice as

It is thought that one billion people I the world,  ______is half the word’s workers, earn their living by farming.

A. if    B. that    C. which   D. what

I began to fish before memory began, _______ I know I have always fished.

 A. so far  B. so as far as  C. as far as  D. so