单项选择。
Lily is upset now. Let’s cheer her _____.
A..in B.out C.up
C
You must have spent hours _______it up.
A.to clean B.cleaning C.clean
B
It’s 10 o’clock now. Let’s go home.
It’s raining outside .Don’t leave ______it stops..
A.so B.since C.until
C
There is nothing left in the box. It’s ________..
A.nice B.exhausted C.empty
C
How long had you watched TV by the time I______you ?
___For three hours .
A.called B.am calling C.have called
A
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