26．Tom is ________ American boy. He can play ________ violin very well.
A. a; the B. a; / C.an; / D. an; the
27.— Do you often go swimming in the river? — No, ________. I’m afraid of water.
A. sometimes B. never C. always D. usually
28. —________ does it take you from Beijing to your home by train?
—It takes about 2.5 hours.
A. How far B. How long C. How much D. How many
