650. Mr. Smith is the only one of those foreigners who _____in China.

　　　　 A. work　 B. is working　 C. are working　 D. has been working　

649. Mr. Herpin is one of the foreign experts who _____in China.

　　　　 A. works　 B. is working　 C. are working　 D. had been working

648. I, _______your close friend, will try my best to help you out.

　　　　 A. who is　　 B. who am　　 C. that is　 D. what is

647. He is the only ____I can fine for the work.

　　　　 A. who’s　 B. whose　　 C. that　 D. which　

646.He talked about the teachers and schools ____he had visited.

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

645. His father is an engineer, ___makes him very proud.

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

644. This is Mr. Smith, ___I think has something interesting to tell you.

　　　 A. who　　　 B. whom　　 C. that　 D. X

643. He met my mother, from ___he got the news of my sister’s marriage.

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

642. Who is the comrade ___was there?

　　　 A. whom　　 B. that 　C. which　 D. whose

641. The book, the cover ___is broken, is not mine.

　　　 A. of it　　 B. for　　 C. whose　 D. of which