41. It is not profitable to provide bus services in districts where the population is widely _____.
42. There are usually at least two _____ of looking at every question.
43. He left in such a hurry that I _____ had time to thank him.
44. As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
45. The book seems to have been _____ from various books and articles.
A. pieced together
B. taken off
C. broken away
D. pulled out
46. We had a marvelous holiday: only the last two days were slightly _____ by the weather.
47. I could tell he was surprised from the _____ on his face.
48. I'd like to take _____ of this opportunity to thank you all for your cooperation.
49. If you ever have the _____ to go abroad to work, you should take it.
50. Scientists think they have _____ in their attempt to find the causes of some major dieases.
A. broken through
B. worked out
C. fallen out
D. got round
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