A boy who was cleaning shoes in the street said to a young man _____by,“Let me clean your shoes, ____?”The young man said,“No, thank you.”“You may ____ me only a pound for that, sir.”said the boy. ___the young man refused again.
Then the boy told him that he would clean his shoes for ____ . The young man agreed to this,and soon one of his shoes was shining brightly.  The man wore ____ shoe ,but the boy refused to clean it unless(除非) he ____ two pounds for his work.. The young man refused to pay anything and went away.  But one looked  ___ dirty that he couldn’t walk away.  He had to ____ and gave the boy _____.  In a very short time his shoes shone brightly.