35. ----How long are you staying?

　 　----I don't know.___________.

A. That's OK 　　B. Never mind　 C. It depends　 D.It doesn't matter

34. Sales of CDs have greatly increased since the early 1990s, when people_____to enjoy the advantages of this new technology.

　　 A. begin　　　　　 B. began　　　　　 C. have begun　　　 D. had begun

33.　 ________ is often the case, we have worked out the production plan.

　　 A. Which　　　　 B. When　　　　　 C. What　　　　　 D. As

32. The____________house smells as if it hasn't been lived in for years.

A. little white wooden 　　　B. little wooden white

C. white wooden little 　　　D. wooden white little

31. The old man, ____________abroad for twenty years, is on the way back to his motherland.

　　 A. to work　 　B. working 　　C. to have worked 　D. having worked