56. The time has come ________ we can make extensive use of nuclear energy.
A) when
B) while
C) as
D) since（D）
57. Hardly ________ the helicopter ________ when the waiting crowd ran toward it.
A) has ... landed
B) had ... landed
C) would ... land
D) was ... landing（A）
58. Although the weather was very bad the buses still ran on ________.
A) list
B) schedule
C) plan
D) arrangement（A）
59. The situation today is obviously quite different from ________ it was only 50 years ago.
A) such
B) which
C) when
D) what（D）
60. Jane was hit on the head by the robber and was knocked ________.
A) mindless
B) unconscious
C) brainless
D) unaware（B）
61. The traffic was very heavy, otherwise I ________ here 50 minutes sooner.
A) would be
B) should be
C) had been
D) would have Been（B）
62. ________ you decide to take up, you should try to make it a success.
A) If only
B) Unless
C) Whatever
D) Whenever（C）
63. This bird’s large wings ________ it to fly very fast.
A) make
B) cause
C) enable
D) ensure（B）
64. In most of the United States, the morning newspaper is ________ by school-age children.
A) directed
B) discharged
C) derived
D) delivered（A）
65. It was not until be arrived at the station ________ he realised he had forgotten his ticket.
A) that
B) before
C) when
D) after（C）
66. Though the long-term ________ cannot be predicted, the project has been approved by the committee.
A) effect
B) effort
C) affect
D) afford（A）
67. He asked ________ since he had been chairman for seven years.
A) not to be re-elected
B) to be not re-elected
C) not to have been re-elected
D) to have not been re-elected（B）
68. Only by shouting at the top of his voice ________.
A) he was able to make himself hear
B) was he able to make himself hear
C) he was able to make himself heard
D) was he able to make himself heard（D）
69. Jane was fairly good at English, but in mathematics she could not ________ the rest of the students in her class.
A) put up with
B) do away with
C) keep up with
D) run away with（C）
70. He went ahead ________ all warnings about the danger of his mission.
A) in case of
B) because of
C) prior to
D) regardless of（D）
责任编辑：sealion1986
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