This problem is so tough that only______ students can solve it.
—How often do you see your grandparents? —_______. A. Five days B. Once a month C. In a week
I usually go to school on _______ foot. A. a B. the C. /
Wang Yaping is the first woman astronaut who taught lessons in space. Do you know _______?
You aren’t supposed to ask the boy to buy things for you. _______, he is too young.
—What a hot day it is! —So it is. I think an umbrella can help you _______ the heat.