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51. All flights ________ because of the snowstorm, many passengers could do nothing but take the train.
A) had been canceled
B) have been canceled
C) were canceled
D) having been canceled（D）
52. ________ seeing the damage he had done, the child felt ashamed.
A) By
B) On
C) At
D) For（B）
53. Remember that customers don’t ________ about prices in that city.
A) debate
B) consult
C) dispute
D) bargain（D）
54. Research findings show we spend about two hours dreaming every night, no matter what we ________ during the day.
A) should have done
B) may have done
C) would have done
D) must have done（C）
55. I hope that you’ll be more careful in typing the letter. Don’t ________ anything.
A) lack
B) withdraw
C) omit
D) leak（C）
56. This crop does not do well in soils ________ the one for which it has been specially developed.
A) outside
B) other than
C) beyond
D) rather than（B）
57. “You are very selfish. It’s high time you ________ that you are not the most important person in the world,” Edgar said to his boss angrily.
A) realized
B) have realized
C) realized
D) should realize（A）
58. These two areas are similar ________ they both have a high rainfall during this season.
A) to that
B) besides that
C) in that
D) except that（C）
59. The tomato juice left brown ________ on the front of my jacket.
A) spot
B) point
C) track
D) trace（A）
60. If I hadn’t stood under the ladder to catch you when you fell, you ________ now.
A) wouldn’t be smiling
B) couldn’t have smiled
C) won’t smile
D) didn’t smile（A）
