单项选择题

______ arriving at the spot, the policemen at once helped the passengers to safety.

A．At
B．On
C．The moment
D．As
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单项选择题
--Never thought to meet you here. -- ______ .
A．So did Ⅰ
B．It's a small world
C．I didn't so
D．Glad to meet you
单项选择题
The bus stopped at the bus-stop to ______ the three men waiting there.
A．pick up
B．have up
C．take up
D．put up
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