单项选择题

______ there are a large number of chemical factories, the air is likely to be polluted.

A. That
B. Where
C. Once
D. As
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单项选择题
______ I feel pity on hurricane victims in Southeast Asia, I can't really do very much to help them but contribute my pocket money.
A. As long as
B. When
C. While
D. Even
单项选择题
We were just ______ calling you up ______ you came in, ______ was unexpected.
A. about; when; that
B. on the point of; as; as
C. on the point of; when; which
D. on the point of; as; as
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