_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.
Either you or he _____ interested in playing chess. _____ you or he fond of music at present?
He is one of the boys who _____ here on time. He is the only one of the boys who _____ here on time.
It depends on _______ he has enough money.
______ gets homes first is to cook the supper.
_____ Wang Feng looked after the old woman a whole year moved us all.