After the terrorist attack last month, anyone at the airport heavy bags, bottles of liquid, or whatever, could be stopped and questioned by the police.
When we visited Zhou Zhuang again ten years later, we found it changed so much that we could hardly ________ it.
While________ along the road, Mr. Smith met an old friend of his.
It was with the help of the local guide________ the mountain climber was rescued.
Either you or one of your students________ to attend the meeting that is due tomorrow.
Only when he apologizes for his rudeness________ to him again.