填空题

Fear and its (36) _____pain are two of the most useful things that men and animals (37)_____, if they are properly used. If fire did not hurt when it burnt, children would play it until their hands were burnt away. (38) _____, if pain existed but fear didn’’t, a child would bum itself again and again, because fear would not warn it to keep away from the fire that had burnt before. Fear and pain are (39) _____two guards without which men and animals might soon die out. We suggest fear be properly used. If, for example, you never go out of your house because of the danger of being (40) _____down and killed in the street by a car, you are letting fear rule you too much. Even in your house you are not (41) _____safe: an airplane may (42) _____on your house. The important thing is not to let feat rule you, but (43)) _____to use fear as your servant and guide. In many cases, (44)______________. For example, you see a car coming straight towards you; fear warns you, you jump out of the way, and all is well. (45)_____________. In this case, fear has given you its warning; you have examined it and decided on your course of action, (46)______________.