He has been _______ for three weeks. We’d better find another person to fill his place.
The government has taken some measures to solve the shortage of electricity, but it may be some time ______ the situation improves.
He reminded me that the poor weather may have ___ the small crowd.
I have no idea ___ David is in trouble, he will turn to you for help.
Who do you think Mr. Brown had ___ within three months?
The most useful learning in the world is that ___ teaches us how to die well.