单项选择题

We tried to keep a （）, but he looked so ludicrous.

A．straight look
B．serious look
C．straight face
D．strict face

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单项选择题
（）is called erosion (侵蚀).

A．Land which wears away,
B．The wearing away of land
C．To wear away land
D．Wearing away land
单项选择题
We do not permit （）in the office, so we do not permit him（）_ here.

A．to smoke; to smoke
B．smoking; to smoke
C．smoking; smoking
D．to smoke; smoking
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