261.______ rapid progress has he made that we all admire him.
A.Very B.So C.Such D.Too
262.When ______ about one of the biggest problems today，many people say that an energy crisis is approaching and is threatening mankind’s survival.
A.asking B.being asked C.having asked D.asked
263.During the reconstruction of the city，many modern tall buildings went up ______ old shabby houses were torn down.
A.where B.in what C.in which D.which
264.For six or seven months in a year here no work can be done ______ the rainy season makes it impossible.
A.when B.that C.until D.though
265.A rainforest is usually found ______ heavy rainfall is frequent.
A.there B.which C.because D.where
266.______ her home，Mary helps her mother do some housework.
A.As soon as she returns B.On arriving
C.After she gets D.Directly she reaches
267.while B.after C.in case D.the minute
268.You can，______ the sky is clear，see as far as the old temple on top of the mountain，but not today.
A.when B.where C.though D.because
268.They decided to chase the cow away ______ it did more damage.
A.unless B.until C.before D.although
269.______ it is true that a successful businessman or inventor will usually become rich，many other people who are outstanding in their fields take little notice of personal possessions.
A.While B.Since C.Unless D.If
270.—How long do you think it’ll be ______ I can go back to work?
—Well，you’ll be feeling much better by next weekend.
A.before B.when C.until D.that
271.I don’t know what will become of me ______ I am out of work.
A.that B.whenever C.when D.whether
272.No matter ______ a full schedule you have，only when you try really hard ______ always fit some more
things in it.
A.how;can you B.what;can you C.which;you can D.when;can you
273.This problem may lead to more serious ones if ______ unsolved.
A.making B.left C.remained D.keeping
274.The dog，if ______，will be made a good watchdog.
A.to train properly B.being trained properly
C.properly to train D.trained properly
275.Fully ______ to teaching，Mr. Li has no time to have his hair cut.
A.committing B.committed C.being committed D.having committed
276.This novel is set in the highly developed city，Shanghai，so once ______ ，it will capture the hearts and minds of many ambitious youths.
A.publishes B.having published C.publishing D.published
277.—Excuse me，did you notice whether the No.108 bus had gone by?
—Nor ______ I’ve been standing here.
A.as B.when C.since D.while
278.As is known，______ we know some basic knowledge concerning AIDS，we can protect ourselves from being
A.as far as B.if only C.so long as D.unless
279.—You seem to have had that car for years.
—Yes，I should sell it ______ it still runs.
A.before B.during C.until D.while
280. ______ I respect you，I don’t agree with your viewpoint ______ she is failing to find a well-paid job again.
A.When;which B.As;where C.If;how D.While;that