单项选择题
Strike ______ the iron is hot.
A．if
B．when
C．as
D．while
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单项选择题
Although cats cannot see in complete darkness their eyes are much more ______ to light than are human eyes.
A．glowing
B．brilliant
C．sensitive
D．gloomy
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单项选择题
The teacher was busy ______ sums upon the blackboard. She was too busy ______ the students' questions.
A．to write out; answering
B．to write out; to answer
C．writing out; to answer
D．writing out; answering
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