[填空题]Fear and its companion pain are two of the most useful thing that (1)
men and animals possess, if they are properly used. If fire did not hurt
when it bum, children would play with it until their hands were burnt away. (2)
Similarly, if pain existed but fear did not, a child would burn itself again
and again, because fear would not warn it to keep away the fire (3)
that had burnt it before. A really fearless soldier-and some do exist-is
not a good soldier so he is soon killed, and a dead soldier is of no (4)
use to his army. Fear and pain are therefore two guards with which (5)
men and animals might soon die out. In our first sentence we suggested
that fear ought to be properly used. If, for example, you never go out of
your house because the danger of being knocked down and kille

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