In the United States, ______is the fastest growing fuel.A．natural gasB．coalC．oilD．hydropow

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

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

In the United States, Thanksgiving Day is the______Thursday of November.A．firstB．secondC．t

One of the most important lakes in the United States is______, which is the largest fresh