20. ----- Have you been here before?

　 ----- Yes. This is the third time that I _______ to Shanghai .

A. come　　　　　　　 B. came　　　　　　　　　　　 C. have come　　　　　　　 D. had come

19. ---- Will you go to attend her wedding?

　----- No, ________ invited to.

A. as if　　　　　　　　 B. even if　　　　　　　　　　　　　 C if　　　　　　　　　　　 D. whether

18. From her _____, I guess she must come from the West of America.

A. sound　　　　　　　 B. voice C. accent　　　　　　 D. noise

17. ----- _______I didn’t hear you clearly. It’s too noisy here.

　------ I was saying that the party was great.

A. Repeat.　　　　　　　　　　　　　 B. Once again.　　　　　　　　　 C. Sorry?　　　　　　　　　　　 D. So what?