单项选择题

In Disneyland, every year, some 800,000 plants are replaced because Disney refused to ______ signs asking his "guests" not to step on them.

A．put down
B．put out
C．put up
D．put off
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单项选择题
If the seller fails to provide good title, the contract will become null and ______.
A．vacant
B．void
C．broke
D．bubble
单项选择题
Our son doesn't know what ______ to at the university; he can't make up his mind about his future.
A．take in
B．take up
C．take over
D．take after
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