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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 _______________ (失業(yè)) depress wages? 

二、選擇題

（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、

The watch comes with three years’ g_____________, ie a promise to repair it free for three years after being bought.

14、I don’t _________ rock ’n’ roll. It’s much too noisy for my taste.

A. go after      B. go away with     C. go into        D. go in for

13、It was with great joy           he received the news that his lost daughter had been found.

    A．because        B．which     C     C．since          D．that

12、Having been ill in bed for nearly a month ,he had a hard time________ the exam.

A．pass           B．to pass        C．passed         D．passing

11、It is certain that he will__________ his business to his son when he gets old.

A．take over      B．think over     C．hand over      D．go over