The aging population _____ each day .There must be some kind of interesting activity for the old.

Is everyone out of the fire—No, _______ two men are still in the burning house.

America has more than fifty states, ______, Kentucky, is the place _______ Abraham Lincoln was born.

It was reported that one-third of the passengers in the bus in the traffic accident last week.

Peter usually goes to school by ______ bus.