One of the rules is that every student ________ wear school uniform while at school.

—Someone is knocking at the door. Is it Ann?—It _____ be her. She is giving a performance at the theatre now.

There’s still an hour left, you _____ go in a hurry. 

The new shop announced that the first to purchase goods on the opening day         get a big prize.

Tigers like to eat _____________, but koalas like to eat____________.