单项选择题

The ascent of the mountain is ______, but anyone who makes it to the top is rewarded by spectacular view.

A. helpful
B. assiduous
C. arduous
D. unique
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单项选择题
When a psychologist does a general experiment about the human mind , he selects people and asks them questions ______.
A. at length
B. at random
C. in essence
D. in bulk
单项选择题
By the end of the month all but two people ______.
A. have left
B. will leave
C. will be leaving
D. will have left
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