Each year, the U. S. spends more money on health care than the previous one.A．RightB．Wrong

Compared with the country with the longest life expectancy, the U. S. isA．nearly 3 years b

Who is William Cohen？A．The head of a U. S. company.B．A former U. S. defense secretary.C．An

Which of the following details about the news is INCORRECT？A．In the past 10 years, U. S. p

What is the main idea of the passage？A．The White House improves U. S. oil production.B．U.

U. S. senators serve for______years after they are elected.A．fourB．sixC．threeD．two

The estimates of the numbers of home-schooled children vary widely. The U. S. Department o