单项选择题

Sam did nothing else than ______ when he saw the old lady fell down on the ground.

A．stand by
B．standing by
C．stood by
D．stood up
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单项选择题
______ you park your car in the marked parking lot, you will be fined.
A．Until
B．If not
C．Provided that
D．Unless
单项选择题
They used to go shopping in the supermarket run by a foreigner, ______.
A．Mary's mother used to
B．so used Mary's mother
C．so did Mary's mother
D．also Mary's mother
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