单项选择题

Although they plant trees in this area every year the tops of some hills are still ________.

A．blank
B．hollow
C．vacant
D．bare
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单项选择题
Don't lose heart! You should ________ your courage and overcome the difficulty.
A．hold up
B．set up
C．pull up
D．pluck up
单项选择题
You should ________ that he had been in bad health these days. He could do much better if he were well.
A．take into account
B．account for
C．take for granted
D．count on
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