单项选择题

I doubt whether he can _______ his efforts much longer as he looks very tired.

A．keep up
B．keep on
C．keep in
D．keep at
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单项选择题
Supposing you were asked to study a second foreign language _______
A．what your choice will be
B．what would be your choice
C．what will be your choice
D．what your choice would be
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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