20.Many of them turned a deaf ear to his advice,　　 they knew it to be valuable.

A. even though　　 B.now that　　 C. as if　　 D.so that

19.With the temperature　　　 so rapidly, we couldn’t go on with the experiment.

　 A. fall　　　 B. fell　　　 C. falling　　 D. fallen

18.How did it　　　 that he knew where we were？

　 A.bring about　　 B.bring in　　e about　　e across

17.---I failed in the English test last week.

　 ---　　　 .He got a score of 40.

　A.Jack did so　　 B. So did Jack　　 C.So Jack did　 D.So was Jack

16.We told him 　　　alcohol and smoke but he ignored all our warnings.

　A. not drinking　　 B. to drink　　 C. to not drink　　 D. not to drink

15.　　 is often said that human beings are naturally equipped(配备) to speak.

　A. This　　 B. That　　 C. It　　 D. One

14.They use computers to keep the traffic　　　 smoothly(顺畅).

　A. being run　 B. run　 C. to run　 D. running

13.What I need is 　　　book that contains　　　 ABC of oil painting.

　A.a;/　　 B.the;/　 C.the;an　 D. a;the