In the United States, ______is called the "Father of Waters".A．the Mississippi RiverB．the

The United States today is the______largest country in size in the world.A．secondB．thirdC．

______ , located in New England, is the oldest city in the United States.A．ChicagoB．Boston

In the United States, the Senate is presided over by______of the United States.A．the presi

In the United States, the legal smoking age is______.A．16B．18C．20D．21

The Statue of Liberty in the United States is located in the state of______.A．HawaiiB．Ohio

In the United States, the legal drinking age is______.A．16B．18C．20D．21