______ is the richest man in our city?
_______ boys and girls in that school are almost equal.
Every possible means ______to prevent the air pollution, but the sky is still not clear.
It’s already 10 o’clock. I wonder how it_______ that she was two hours late on such a short trip.
Gone are the days when women were ____
______ I can see, there is only one possible way to keep away from the danger.