This book isn’t mine. ________can it be?

-----Who ______ it be that hasn’t handed it in yesterday? ------It _______ be Bob. He handed it in yesterday.

—Do you think the rain will affect the football match?—The players are used to such rainy weather, so it ______ make any difference to them.

He used to _______ in a village, but now he has been used to _______ in the big city.

--Who’s singing in the next room? Is it Lucy?---It       be her. She has gone to New York.