If there ______ no water or air on the earth, all living things would die.

Teresa looks so painful. There _______ be something wrong with her.—Oh dear! We’d better take her to the nearest hospital at once.

I’m going to see what Dad is________. Twohours is a long time to take over a coffee.

My father _________ in a school. He ________a teacher.

The news about the flood surprised all______.