-Who is the girl standing over there?-Well, if you ______ know her name is Mabel.
—I wonder whom you are waiting for.—The policeman the traffic accident.
moment he saw Zhao Benshan’s funny performances, he burs into laughter.
Had the weather been good, the children ____ out for a walk.
The news has just ___ that the president is going to visit China next month.
By looking at a problem in as many ways as possible, creative thinkers can find solutions that would ___ remain invisible.