单项选择题

Each pair of penguins lives together with ______.

A．their parents
B．some good neighbors
C．many other penguins
D．their chicks
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单项选择题
At first they worried about the situation but things ______ quite satisfactory.
A．went on
B．carried on
C．worked out
D．tried out
单项选择题
It sounded ______ down the rail.
A．as a train running
B．like a train to run
C．like a train running
D．as if a train running
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