单项选择题

The speech ______, a lively discussion started.

A．to deliver
B．be delivered
C．delivering
D．having been delivered
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单项选择题
When I try to understand ______ that prevents so many Americans from being so happy as one might expect, it seems to me that there are two causes.
A．why it does
B．what it does
C．what it is
D．why it is
单项选择题
Some hard plastics can ______ metals in manufacturing machine parts.
A．take place for
B．take the place for
C．take place of
D．take the place of
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