单项选择题

I'm surprised that you should have been fooled by such a(an)（）trick.

A.ordinary
B.easy
C.smart
D.simple

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单项选择题

The American economy is still in trouble，（）the Chinese economy is beginning to pick up.

A.when
B.however
C.while
D.therefore

单项选择题

You are always full of（）.Can you tell me the secret？—Taking plenty of exercise every day.

A.power
B.strength
C.force
D.energy