小完形填空：When you spend your entire life
When you spend your entire life _(1)_ that your kind is all-powerful and that none can ever _(2)_ you,it can be a great shock to realize that this is not the case.All empires _(3)_ fall.
(1)
A.believing
B.to believe
C.on belief
D.believed
(2)
A.duel
B.battle
C.equal
D.challenge
(3)
A.must
B.can
C.will
D.should
答案是ADA