About ___of the workers in the factory were born_____.

Thank God you’ re safe!— I stepped back, just ________ to avoid the racing car.[ ]

The traffic in the city _____ be terrible, but now it has improved a lot. I think you will _____ it soon.

Which is ____ country, America ____ Canada?

下列各句中，加横线的成语使用恰当的一项是（ ）