单项选择题

As a developing country, we must keep______ with the rapid development of the world economy.

A．move
B．step
C．speed
D．pace
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单项选择题
As the director can't come to the reception, I'm representing the company______.
A．on his account
B．on his behalf
C．for his part
D．in his interest
单项选择题
The manager will have to hire two more people to______ the lost time.
A．make up of
B．make up for
C．make out
D．make off
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