---There’s someone knocking on the door. Who _________ it be?---It must be John. He promised to be here at 8:00.
— I’m sorry, I shouldn’t have been so rude to you. — You _____ your temper,but that’s OK.
Your story is perfect; I’ve never heard ________ before.
Not only __________ interested in football but _________ beginning to show an interest in it.
The possibility _________ we won’t produce enough goods troubles everyone here.
I don’t like sports _________ people easily get hurt.