每月末，在最后一张记账凭证填制后，应在编号旁加注（）字，以免凭证散失。

A．“完”

B．“全”

C．“结”

D．“止”

Our firm is with in（）from the airport.

A.thirty minutes’ drive

B.adrive of thirty minutes

C.driving for thirty minutes

D.driving car by thirty minutes