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