完形填空。

A teacher can 　　1　　 at any age．My neighbor Smith's daughter Chrissie was only ten years old when she started 　　2　　．How did Chrissie 　　3　　 the work?It was not easy．Chrissie wanted 　　4　　children who can not hear．But school had never had 　　5　　 young girl helper．Could Chrissie do it?First Chrissie learned to talk by 　　6　　 her hands．Then she could 　　7　　 well with the children．So the school 　　8　　 her help．Now Chrissie 　　9　　 the school almost every day．The children 　　10　　 their young teacher．She is their friend．

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Miss Richards was a teacher at a school for boys and girls．She 1 ndline　 chemistry and physics from the lowest to the highest classes in the 2 ndline．Sometimes the new classes 3 ndline　 rapidly(迅速地)，but sometimes they were very 4 ndline，and then Miss Richards had to 5 ndline　 things many times．

　　One year，the first class had been studying chemistry for several 6 ndline　 when Miss Richards suddenly asked，“What is water? Who knows? 7 ndline　 up!”

　　There was silence(沉默) for a few seconds，and Miss Richards felt saddened(難過),but then one boy 8 ndline　 his hand．

　　“Yes，Dick?”said Miss Richards encouragingly(鼓勵地)．He was not one of the brightest children in the class，so she was 9 ndline　 that he could answer．

　　“Water is a liquid which has no 10 ndline　 until you wash your hands in it，Miss．Then it turns black，” the boy replied with great confidence(信心)．

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