单项选择题

I (was just) falling (sleep) last night (when) I heard a knock (at) the door.

A．was just
B．sleep
C．when
D．at
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单项选择题
John said his mother (would buy) him a (five-speeds) racing bicycle (for) his (sixteenth) birthday.
A．would buy
B．five-speeds
C．for
D．sixteenth
单项选择题
(It is important) (that) she (goes) to see the doctor (immediately).
A．It is important
B．that
C．goes
D．immediately
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