Jack is a famous writer now. But he said he was not a good student when he was young. He was often late for class and didn' t like doing his homework. Sometimes he slept in class while the teacher was teaching. He didn't understand much, but he always thought he understood everything.
　　One day the teacher asked the students a question. "When John was ten years old， his brother was twenty. John is fifteen now and how old is his brother？" Jack answered， "That's easy. His brother is twice as old as John, so he is now thirty. "
　　Another time, the teacher in a science class asked, "When it thunders（打雷）， why do we always see the light before we hear the sound？" "But, Miss White, " said Jack quickly. "can't you see our eyes are in front of our ears？"
　　The third time, the teacher in a biology class asked, "Why can fish swim in the water？""But, Miss White，" said Jack quickly， "don't you know fish can't walk on land？"
（1） Jack was not ______ when he was young.
A.strong
B. lazy
C.clever
D. well
（2） Jack didn't like to ______ when he was a student.
A. write compositions
B. do his homework
C. do the housework
D. learn science or biology
（3） How old is Jack's brother now when Jack is fifteen in the story？
A. Ten years old
B. Fifteen years old
C. Twenty years old
D. Twenty five years old
（4） When it thunders, we always see the light before we hear the sound. It's because ______.
A. our eyes are in front of our ears
B. our eyes are cleverer than our ears
C. our eyes can see but our ears can't
D. light goes faster than sound
（5） Why can fish swim in the water？ Jack's answer is ______.
A. fish can't walk on Bandsh can't swim on land
C. fish can't walk in tefiwateas no legs or hands