Ballet is not popular our city because most people think it is too expensive to take the classes.
More consumers are waiting for the further drop of housing prices with money in their hands _______ buying houses, according to a report.
When asked to explain _____ he did to make his students so fascinated with his lessons, the teacher paused and thought deeply.
If you find yourself ______ no one will help you, please call me.
It be the vocabulary that caused you the problem in the exercise because you know a lot of words.
At no time _______ the rules of the game. It was unfair to punish them.