1. Walter offered us a lift when he was leaving the office, but our work _A_, we declined the offer. [declined v. 婉言谢绝]
A not being finished B not having finished
C had not been finished D was not finished
2. A survey was carrie3d out on the death rate of new-born babies in that region, _D_ were surprising. [survey 调查]
A as results B which results C the results of it D the results of which
3. All flights _D_ because of the snowstorm, many passengers could no nothing but take the train. [having been canceled这里是独立主格作原因状语]
A had been canceled B have been canceled
C were canceled D having been canceled
4. _A_ the calculation is right scientists can never be sure that they have included all variables and modeled them accurately. [variable n. 变项，变量；model vt. 建模]
A Even if B As far as C If only D So long as
even if 即使，即便； so long as （后面加句子时）只要。
5. My train arrives in New York at eight o'clock tonight. The plane I would like to take from there _B_ by then.
A would leave B will have left C has left D had left
将来完成时：will have + 动词过去分词。
6. Harry was _A_ by a bee when he was collecting the honey.
A stung B stuck C bitten D scratched
sting v. （蜜蜂）叮，蛰； bite v. （蚊子等）咬； scratch vt. 抓伤，划破（通常指猫抓人）。
once bitten, twice shy. 一朝被蛇咬，十年怕井绳。
7 The thief tried to open the locked door but _B_.
A in no way B in vain C without effect D at a loss
in vain 徒劳，白费工夫； But很少与介词without联用； at a loss 不知所措。
8. _B_ seeing the damage he had done, the child felt ashamed.
A By B On C At D For
on后面加动词ing形式表示“在…之后”这个时间概念。
9. Research findings show we spend about two hours dreaming every night, no matter what we _C_ during the day.
A should have done B would have done C may have done D must have done
should have + 动词过去分词，表示本应该做； may have + 动词过去分词，表示可能做过；
与过去事实相反的虚拟语气主句谓语动词的表达形式可能用到：would have + 动词过去分词。
must have + 动词过去分词，表示对过去行为进行肯定推测。表示一定做过；
can't have + 动词过去分词，表示对过去行为进行否定推测，表示不可能做过。
