16. By the end of this year Mr. Smith ________in our company for exactly three years.

A) is working

B) has worked

C) will work

D) will have worked

17. I think that the Great Wall is worth ____________hundreds of miles to visit.

A) to travel

B) traveling

C) traveled

D) travel

18. The new staff didn’t know how to use the system _________ I explained it to him yesterday.

A) until

B) because

C) if

D) since

19. _____________is reported in the newspapers that the talks between the two companies have not made any progress.

A) That

B) What

C) It

D) As

20. __________by the failure of the project，the manager could hardly say a word.

A) To be shocked

B) Shocked

C) Be shocked

D) Shocking

21. The first question we now discuss is _______ early tomorrow.

A) whether

B) where

C) what

D) whom

22. He was attending a meeting, ________he would have come to your party yesterday.

A) unless

B) when

C) but

D) or

23. Enclosed you ________an application form that you are asked to fill out.

A) will find

B) find

C) found

D) are finding

24. The auto industry spends large amounts of money on marketing campaigns _________young adult customers.

A) attract

B) attracted

C) to attract

D) attracts

25. The advertising company recently hired a designer ____________had once won a prize in a national contest.

A) whose

B) which

C) whom

D) who

答案：16-20:DBACB 21-25:ADACD