She keeps a supply of candles in the kitchen in case of power ______.
The athlete’s years of hard working _______ when she finally won the Olympic gold medal.
_______ the English examination, I would have gone to the concert last Sunday.
The designer asked _______ we were getting on well with the project.
Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.
I will never know what was on his mind at the time, nor will _______.