John is a famous writer now. But he said he was not a 1 student when he was young. He was often late for 2 and didn't like doing his homework.

　　Sometimes, he slept in class while the teacher was teaching. He didn't understand much, 3 he always thought he understood everything. One day the teacher 4 the students a question, “When Jack was ten years old, 5 brother Bob was twenty. Jack is fifteen now and 6 is his brother Bob?” John said, “That's easy. Bob is twice as old as Jack, so he is now thirty.”

　　Another time, the 7 in a science class asked, “When it thunders(打雷), 8 do we always see the light before we 9 the sound?”

　　“But, Miss,” said John quickly, “don't you 10 our eyes are in front of our ears?

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John is a famous writer now. Bob said he was not a good student ___41_____ he was young. He was often late for____42___ and didn’t like doing his homework. Sometimes, he ______43____ in class while the teacher was teaching. He didn’t understand much, ____44____but he always thought he understood everything. One day the teacher _____45___ the students a question, “When Jack was ten years old, _____46____ brother Ben was twenty. Jack is fifteen now and _____47___ is his brother Ben? John said, “That’s easy. Ben is twice as old as Jack, so he is thirty now.”

Another time, the ____48_____ in a science class asked, “When it thunders(打雷), _______49___ do we always see the light before we hear the sound?”

“But, Miss,” said John quickly, “don’t you ___50_____ our eyes are in front of our ears?”