People have planted a great many trees in order to________ wind and sand in the desert.
—Where is your brother? —He has gone to Beijing. Heback in three days.
—Ann, I am worried I’m getting fatter. What shall I do? —I think you should eat________ food and do more exercise.
they are twins, they don’t look the same at all.
Tom helped us settle down in this new city, is very kind of him.
—I am going to America. —how long you there?