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

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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
单项选择题
Wind and rain continually hit against the surface of the Earth, （） large rocks into smaller and smaller particle.

A．to break
B．would break
C．breaking
D．broken
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