20．The prices of houses, ________ is often reported, have been going up sharply in the past few months.

A．which　　 　　　　 B．it　　　 　　　　　　　 C．as　　　 　　　　　 D．what

19．The city government is planning to build a factory to deal with the industry waste, but when and where to build it _______.

A．haven’t been decided　　　 　　　　　　　　 B．aren’t decided

C．hadn’t been decided　　 　　　　　　　　　　 D．hasn’t been decided

18．-Look! I’m getting fatter and fatter. What can I do?

　　 -________. Do more exercise and you will be all right.

　　　 A．Slow it down　　 B．Don’t worry　　 C．That’s right　　 　 D．Don’t mention it.

17．-Jack, don’t just repeat what _____ teacher of our class has told us. Try to express yourself in your own words.

　-OK. Er…, could I have _____ discussion with my classmates first?

A．the, the　　 　　　 B．a, a　　 　　　　　　 C．a, the　 　　　　　　 D．the, a

16．Wang Lin failed to be admitted by Hong Kong University last year, and only then _________ the importance of English.

A．he finally realized　　 　　　　　　　　　　　　　 B．he had realized

C．had he realized　　　 　　　　　　　　　　　　　 D．did he realize

15．Strangely, the two men look _____ alike that nearly all the people think they are twin brothers.

A．too much　 　　　 B．such much　　 　 C．much too　 　　　 D．so much

14．Professor Backman took up scientific research for decades, and this is ______ he devoted all his life to.

A．which　 　　　　　　 B．what　　 　　　　　 C．where　　 　　　　　 D．how