23、Since no other way to escape from the flood, ____ only safe thing is to take ____chance.

A．an ; 不填        B．the ; a          C．an; a          D．不填；the

22、— How many of them do you want to act in the play?

—_______ , and still a large number needed!

A．All           B．Both           C．Neither         D．None

21、Theory is based on practice and ________ serves practice．

A．in turn          B．by and by           C．by chance         D．in this case

20、Look at the new computers, of ______ none are produced abroad.

A．them       B．whom         C．which         D．these

19、—What about the picnic plan?

 —Not ________ yet．It’s being discussed..

A．decided           B．decide         C．deciding            D．to be decided

18、After dry days, everyone appreciates ______ when there is a timely rain．

A．that         B．one        C．this          D．it

17、While reading, you should not always ___________ a dictionary to find the meaning of each new word.

A．look up         B．turn to            C．look for        D．turn out

16、—Do you know what to do in the lab, Mike?

—Oh, sorry I don’t----just _____if I could get a ticket for the Shanghai Expo.

A．wonder           B．wondered            C．wondering          D．having wondered

15、A man of value never thinks of everything only in ______ of money.

A．terms              B．orders            C．times         D．sights

14、—How ?????_____ you have been late then in such a small town?

—Lots of turns in the streets, and the buildings look all the same.

A．can                 B．could               C．may               D．must