20．What evidence does the Japanese team _______ that they really reached the summit of .Mt. Qomolangma?　　　　　　　　

　 　　 A．have been proved　　　　　　 　　　　　 B．have being proved

　　 C．have to prove　　　　　　　 　　　　　 D．have proved

19．-----Was it under the tree 　　　　　you laid your bike when away posting the letter in the post office?

　 -----Sure. But when I got back, it was gone. It's a gift bike from my parents.

　　 A．that　　　 　　　　　 B．where　　 　　　　 C．While　　 　　　　　 D．which

18．------Most foreigners can hardly understand Shanxi Opera.

　 ------　　　　 , an overseas Chinese living abroad for decades.

　 　　 A．So could Mr. Wang:　　　　　 　　　　　 B．Neither can Mr. Wang

　 　　 C．So couldn't Mr. Wang　　　　 　　　　　 D．Hardly can Mr. Wang

17．After the terrorist attack last month, anyone at the airport _______ heavy bags, bottles of liquid, or whatever, could be stopped and questioned by the police.

　 A．seen carrying　　　　　　　　 　　　　 B．seen carry　　　

　 C．seen to carry　　　　　　　　　 　　　 D．seen to be carrying

16．-----Computers now can do almost everything people can do.

-----Yes. Most scientists, _______, agree that computers cannot completely take the place of humans.

　 　　 A．though　 　　　　　　 B．therefore　　　　 C．too　 　　　　　　　 D．then　

15．This experiment will show us _______ can be used in the modern laboratory.

　 　　 A．that you have invented　　　 　　　　　　 B．how that you have invented

　 　　 C．that how you have invented'　 　　　　　 D．how what you have invented