---Who ______ it be that hasn’t handed it in yesterday. ---It _______ be Bob. He handed it in yesterday.
Could you please tell me where you bought the shoes you ____ yesterday?
I really can't understand _ ___ her like that.
It was a pity that the great writer died _____his works unfinished.
Playing tricks on others is___we should never do
He accidentally ___ he had quarreled with his wife and that he hadn't been home for a couple of weeks.