21、 ―How are you getting along with your new job and your classmates?

― ______.

      A. I can’t tell you                                               B. So far, so good

      C. I’m glad you asked me about it                        D. I’m not getting along with Jane

20、The light will be thrown ______ the cause of cancer by research that is now in progress.

      A. to                             B. upon                         C. in                       D. for

19、When you are reading fast, your eyes will be one or two word groups ahead of ______ your mind is taking in.

      A. one                           B. others                       C. the others            D. the one

18、―Darling, our friend has arrived.

―I’m on the way ______ home. You try to make himself ______ home first.

      A. /; /                            B. to; at                         C. /; at                    D. at; by

17、 Does mass _______________ (失业) depress wages? 

二、选择题

（每空？ 分，共？ 分）

16、We need to establish a system to control the total amount of p_______________ discharge (排放) into the key sea areas, especially chemical wastes.

15、----How long are you staying?

----I don't know.___________.

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

14、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

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

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

12、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