单项选择题
A.American football might develop in different places. B.American football is supposed to be changeable. C.American football will have its own rules. D.American football might see changes in the years to com
A.when I have power, I will have happiness B.being a boss is more important than feeling happy C.when I become a boss, I will never search for happiness D.boss and this thing mean the same to boss and I
A.collect B.pile C.raising D.increase