One afternoon in January in 1998, Susan Sharp, 43, and her 8-year-old son David, were walking across an icy square, when Susan's cane(手杖) slipped on the ice. Her face   36   first into the mud. David   37   her mother's side, “Are you all right, Mom”   38  , Susan pulled herself up, “I'm okay, Honey,” she said.

Susan was falling more   39   since she had trouble walking. Every inch of ice was a   40   danger for her. “I wish I could do something,” the boy thought. David, too, was having   41   of his own. The boy had a speech problem, so at school he talked   42  .

　　One day, David's teacher announced a   43   homework. "Each of you is going to come up with an   44  ," she said. This was for "INVENT AMERICA", a national competition to encourage creativity in children.

　　An idea   45   David one evening. If only his mother's cane didn't slip on the ice. “What if I   46   your cane to a nail coming out of the bottom” he asked his mother.

　　“   47   the sharp end would scratch(划破) floors,” Susan said.

　　“No, Mom, I   48   make it like a ball-point pen. You take your hand off the button and the   49   returns back up.” Hours later the cane was finished. David and his father   50   as Susan used it to walk 50 feet about the   51  . Happily Susan cried out, “It   52   !”

　　In July 1999, David was  53   national winner for the "INVENT AMERICA". David began to make public appearance. Thus he was forced to communicate  54  .Today, David is nearly free of his speech problem, and his   55   is becoming well accepted.

阅读下面短文，从A、B、C、D四个选项中选出最佳选项。

　　Maureen stood by the lake．Suddenly the other children came running through the trees with sharp cries of the excitement．They rushed up to the 　1　，leaning over the crystal-clear water，and 　2　 the crowds of tiny fish．Some children demanded loudly to go to the boats，but all at once those who had been 　3　 behind at the ice-stall(小摊)came。running up 　4　 some announcement or other，and they all left the water and dashed back 　5　 they had come．With growing excitement，Maureen 　6　 after them．

　　When she saw 　7　 they been running for，she stopped running．They were buying 　8　 again．The toy stall was open and they were crowded around it．Behind the stall a calm middle-aged woman was selling a great variety of small rubbish．She took money from the 　9　 of small hands in exchanging for little boats，plastic dolls，yellow pencils and rubbers，anything．Maureen leaned 　10　 a tree，looking on．The idea of spending washed against her face like a strong current，trying to draw 　11　 in．

　　Nona Parker pushed out to the edge of the group 　12　 laid what she had bought on the ground 　13　 she could what money she had left in her white purse．Under Maureen's eyes 　14　 a boat，a mouth organ，and little plates of dolls'food in colored plasters-a brown load of bread，a joint of beef，a pink pudding(布丁)　15　 tiny and terribly desirable．Maureen was so full of the wish for the things like that she 　16　 bear to look at it．She turned her head 　17　 Her face against the tree，she shut her 　18　 and prayed eagerly for some money，for the price of a set of toy plates．

　　In a moment，she opened her eyes，but she didn't turn back to the shall．It was too 　19　 to see the others buying whatever they wanted．She rubbed al-most round the tree，her eyes on the ground ．And 　20　 at her very feet was a ten pence piece．

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