单项选择题

She was slated to present an abstract of her thesis at the national convention, and so spent the holiday（）

A．touching on it
B．touching it up
C．touching it
D．touching it down

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单项选择题
Obviously, he decided not to say anything about it because he hoped to（）

A．keep it as a secret
B．keep it to be a secret
C．keep it a secret
D．keep it being a secret
单项选择题
The microscope can （）the object 100 times.

A. magnify
B. increase
C. develop
D. multiply
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