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(难过),but then one boy 8 ndline his hand．
“Yes，Dick?”said Miss Richards encouragingly(鼓励地)．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)．
(1)
A.teaches B.teaching C.taught D.teach
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(2)
A.schooling B.school C.schools D.home
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(3)
A.learned B.learning C.had been learned D.were learned