阅读下面的短文，从短文后所给的四个选项中，选出可以填入空白处的最佳选项。
Robert Stephen is a famous research scientist, and he made several very important medical breakthroughs(突破). When he was asked 41 he was so excellent, he said that it all came from an experience with his 42 when he was two years old.
One day, he tried to remove a bottle of milk from a fridge but he dropped 43 . The bottle of milk fell onto the 44 and broke into pieces. At this time, his mother 45 the kitchen. 46 being angry with him or punishing him, she said “Robert, never mind! We could use a sponge(海绵), a towel or a mop to clean this mess, which do you prefer？” Then he chose the sponge to 47 the milk with his mother. After that his mother said, “You know, what we have here is a failed experiment in 48 to effectively(有效地) carry a big milk bottle with two little hands. Let’s go out in the back yard and 49 the bottle with water, and see if you can discover a way 50 carry it without dropping it.” The little boy learned that if he grasped(抓住) the bottle at the top near the lip with both hands, he could carry it 51 dropping it. What a 52 lesson!
From then on, he knew he didn’t need to be afraid to make 53 . He also 54 that mistakes were just opportunities(机会) for learning something new, Which is the scientific experiment about. Even if the experiment fails, we can also learn something 55 from it.
41．A．why B．if C．how D．when
42．A．father B．teacher C．mother D．classmate
43．A．that B．them C．milk D．it
44．A．hands B．yard C．fridge D．floor
45．A．came out B．got out C．came into D．went over
46．A．Instead of B．As for C．Instead D．But
47．A．put up B．clean up C．drink up D．take up
48．A．how B．when C．why D．what
49．A．provide B．connect C．pour D．fill
50．A．to B．for C．at D．of
51．A．on B．without C．with D．in
52．A．terrible B．different C．wonderful D．boring
53．A．experiments B．milk C．mistakes D．meal
54．A．learned B．told C．thought D．reminded
55．A．exciting B．useful C．bad D．real
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