单项选择题

Some of us find it difficult to think in imaginative and flexible ways because ofour _______ pattern of approaching problems.

A．set
B．common
C．popular
D．hard
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单项选择题
Although reservations in advance are usually required in motels in busy areas, this is not always _______ in less crowded parts of the country.
A．the case
B．the reality
C．the truth
D．the fact
单项选择题
The student organizations seem to be effective in _______.
A．dealing with the academic affairs of the university
B．ensuring that the students observe university regulations
C．evaluating students' performance by bringing them before a court
D．keeping up the students' enthusiasm for social activities
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