单项选择题

When the ship was caught in a strong storm at the sea, the captain ______ a danger signal.

A．sent for
B．sent off
C．sent out
D．sent around
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单项选择题
On most of the nights. Jane ______ reading letters from her boyfriend.
A．stayed off
B．stayed on
C．stayed out
D．stayed up
单项选择题
These farmers got a good harvest last year, so they ______ a big sum of money for new farm machines.
A．set aside
B．set about
C．set up
D．set back
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