One at a time, ...one at a time.

　　11. Why did the young man have to leave home?

　　12. What kind of job did the young man find?

　　13. What happened when the storm came?

　　14. How did the sheep get across the single plank?

　　Passage Two

　　Professor Wang is a physics teacher in Beijing.

　　Once she was explaining to one of her classes about sound.

　　She decided to test the students to see how well they had understood her.

　　"I have an uncle in Xinjiang," she said,

　　"Suppose I was calling him on the phone from here

　　and at the same time you were 25 metres away, listening to me.

　　Who would hear me first, my uncle or you - and for what reason?"

　　Ma Hua at once answered,

　　"Your uncle, professor,because sound-waves travel slower than electricity."

　　"Good," said the professor, but then another boy raised his hand.

　　"Yes, Li Ming?" said Professor Wang.

　　"Of course your uncle would hear you first," Limin said,

　　"but that's because of the time difference.

　　When it's nine o'clock here,it's seven o'clock in Xinjiang."

　　15. What did Professor Wang do to check whether the students understood her or not?

　　16. How did Ma Hua make such a judgment?

　　17. How did Li Min give such an explanation?

　　Passage Three

　　Henry Smith taught science at the City School.

　　Once he went to a bookstore and bought some books.

　　Most of which were expensive ones.

　　He left them in his car in a quiet street.

　　Then he went and bought some other things at other shop.

　　At 6 o'clock he came back to the car.

　　One window was open - and the books were gone.

　　Henry drove back to his home in Lake Street

　　that night he wrote a letter to a newspaper.

　　The next day he went to the police.

　　On Friday people read an advertisement in the newspaper:

　　BOOK WANTED

　　Have you any books that you no longer want.

　　I buy old and modern books. Open all day on Saturday.

　　Henry Smith, 18 Lake Street.

　　Henry stayed at home on Saturday.

　　His first visitor came at 8 o'clock.

　　Henry took him to the kitchen.

　　At half past nine, another man arrived.

　　He had a bag under his arm.

　　"Mr. Smith?" the man asked.

　　"That's right," Henry said. "Can I help you?"

　　"I have some good books. You buy books, don't you?"

　　"Yes, bring them in. I'll have a look at them."

　　Soon the books were on the dining-table,

　　"Come in now," Henry called out, "and bring the list."

　　A policeman came into the dining-room.

　　He read the titles on the books and then those on the list in his hand.

　　They were the same.

　　"Come with me,sir,"the policeman said to the man.

　　18. How did the man get the books?

　　19. How did Henry get his books back?

　　20. How did the man find Henry's address?