747.For us Senior Three students,believing that our hard work will _____ can strengthen our confidence.

A.take off

B.pay off

C.keep off

D.get off

748.A completely new situation will ______ when the examination system comes into existence.

A.rise

B.arise

C.arouse

D.raise

747.答案是B；

take off 脱掉，起飞； pay off还清债务，得到好结果;keep off远离，不靠近;get off下车，脱掉。

748.答案是B；

rise vi.提高，上升，增加;arise vi.起身，上升，出现;arouse vt.唤起，唤醒，激发；raise vt.提高，上升，增加，饲养。