It’s quite a time _____ Liu Xiang was injured in the foot, but we are sure it won’t be long _____ he returns to the track.
He seemed to be looking for the words ____ he could express his idea.
A modern city has been set up in ____ was a wasteland ten years ago.
To make members of a team perform better, the trainer first of all has to know their ____ and weaknesses.
In the new century, we still should _____ primary importance to the development of economy.
I remember _____ this used to be a quiet village.