单项选择题

I don't feel secure when I am alone in the house.

A. safe
B. pretty
C. distant
D. obvious
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单项选择题
I admire his work.
A．recognize
B．exploit
C．tolerate
D．esteem
单项选择题
Techniques to employ the energy of the sun are being developed.
A. convert

B. store
C. use
D. receive
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