______ exciting sport it is to climb the mountains!
—Are these books yours, Mike?—No, they aren’t. They belong to ______.
—I think sixteen-year-olds should be allowed to drive.— ______. They aren’t serious enough at that age.
—Let’s visit the sick children in hospital and ______.—OK, let’s go.
—What are you listening to?—A song by Huo Zun. It ______ beautiful.
—I’m busy with my schoolwork these days.—That’s great! You won’t get good grades ______ you work hard.