Which of the following countries lags behind the United States by the largest margin

单项选择题This article is mostly likely taken out of______.

单项选择题A family with 2 adults and '2 children and with clothes washer and dishwasher should purchase a water heater with a capacity of ______ gallon.

单项选择题This passage is primarily concerned with______.

单项选择题Why was Leacock dubbed as a pro-American British imperialist ______

单项选择题The book on the fictional town of Mariposa presumably______.