单项选择题
A.advantages of working at home in the U. S.A. B.computers widely used in the U. S.A. C.the necessity of working at home in the U. S.A. D.working at home in the U.S.
A.visited B.broke into C.entered D.saw
A.he can’t pay back all the money at the end of a certain period B.he pays back all the money before the end of a certain period C.he has lost his credit card D.he wants to stop using the credit card