—My mother is ill. — .
—Fire is very useful to human! —Yes, especially in winter a fire _____________warm.
—Mona, _______ will it take to fly to Guangzhou? —Sorry, I don’t know.
—You didn’t come to the meeting yesterday afternoon, did you? —No, I ________ at the station for my uncle from Beijing.
—Why are you so frustrated, Ben? —I was late for class again. I’m afraid Miss Li will be _________ me.
—Do John and Betty have a child? —Yes. They _______ for twenty years.