__ lack of interest, Tom kepttrying hard to catch up with others

Generally my father is a mild man, but when he gets angry, he ______ be fierce.

Are you _________ that our football team will win the match—____________. We play even better on match point, and it’s __________ that we’re going to win.

Either Tom or Jim _______ at a radio station.

You _______ to leave until you ________ your work.[ ]