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91 Miss Richards was a teacher at a school for boys and girls. She __1 chemistry and physics from the lowest to the highest classes in the __2 . Sometimes the new classes 3 rapidly, but sometimes they were very 4 , and then Miss Richards had to 5 things many times. One year, the first class had been studying chemistry for several __6_ when Miss Richards suddenly asked, "What is water? Who knows? 7__ up?" There was silence (沉默) for a few seconds, and Miss Richards felt sad (难过), but then one boy 8 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 that he could answer. "Water is a liquid which has no 10 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 2. A. schooling B. school C. schools D. home 3. A. learned B. learning C. had been learned | 
