20．Every possible means ______ to prevent the air pollution, but the sky is still not clear.

A．is used　 　　B．are used　 　C．has been used　　 D．have been used

18．It is generally believed that teaching is ___________it is a science.

A．an art much as　　　 　　　　　　　B．much an art as

C．as an art much as　　 　　　　　　　D．as much an art as 19．Entering the house we found him lying on the bed with his mouth _______ and eyes _______.

A．open, close　　　 B．opened, closed　　　 C．opened, close　　　 D．open, closed

17．Few pleasures can equal ________ of a cool drink on a　 hot day.

A．some　 　　　B．any　　 　　C．that　 　　　D．those

16．The warmth of____sweater will of course be determined by the sort of ________wool used.

A．The ; the　 　　　B．the ; /　　 　　　C．/; the　　　 　　D．/; /

15．Anyone in my position would have been ruined if he had been attempted to ___ depths which

not even a lifetime of study could plumb(探索).

A．dive into　 　　　B．look up 　　　　C．agree on　 　　　D．date back

14．--I’ll be away on a business trip. Would you mind looking after my cat?

--Not at all. ____.

A．I’ve no time　　 B．I’d rather not　　 C．I’d like it　　 D．I would be happy to

13．He 　　　to paint the whole house but finished only the front.

A．set about　　　 B．set off　　　　 C．set out　 　　　D．set in

12．It was at twelve o’clock ___ we finally arrived at the village ____ we spent our happy

childhood.

A．that; that　　 　B．when; that　　　 C．when; what　 　　D．that; where

11．--A：How did the audience feel when they saw the ending of the play?

--B：________

A．Excited 　　　B．Excite　　　 C．Exciting　 　　　D．To excite

10．Style is a particular characteristic or feature that　 _______ one object from another.

A．isolates　 　B．distinguishes　 　　C．expresses　 　　D．separates