单项选择题

Tony has to work really hard to （）the others.

A．catch up with
B．look forward to
C．go on with

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单项选择题

They found （）impossible to finish their work on time.

A．this
B．that
C．it

单项选择题

We are thinking about （）to the center of the town.

A．to move
B．moving
C．movement

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