This blue car ____________ be Bob’s bcause his car is black.

Everybody there was _______ by the _______ story.

When I was a child, I ______ watch TV whenever I wanted to.

--- He worked out such different questions at a very young age.--- Oh, he ______ a very smart student then.

--Listen! Someone is knocking at the door. Who _____it be?---It_____be Tom. He phoned to visit me this evening.