填空。 John is a famous writer now. But he said that 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?' (     )1. A. good (     )2. A. sleep (     )3. A. so (     )4. A. sent (     )5. A. your (     )6. A. how many (     )7. A. teacher (     )8. A. what (     )9. A. break (     )10. A. read B. tall B. lunch B. and B. asked B. my B. how old B. farmer B. when B. make B. hope C. rich C. class C. or C. told C. his C. what C. nurse C. where C. hear C. study D. fat D. play D. but D. found D. her D. who D. policeman D. why D. smell D. know