There’s someone knocking on the door. Who _________ it be?—It must be John. He promised to be here at 8:00.

Women __________ drink more than two cups of coffee a day have a greater chance of having heart disease than those __________ don’t.

The boss looked very worried and demanded that the work________before we went home.

(2013·四川高考)________ you said at the meeting describes a bright future for the company

Only when I made it to the train station _______ that I had left my ticket at home.