完形填空。 A store owner was putting a sign a

     A store owner was putting a sign above his door that read "Puppies For Sale". Signs like that have a
way of     1     small children,and     2    enough,a little boy appeared under the store owner's sign. "     3    
are you going to sell the puppies for?" he asked.
     The store owner replied,"     4    from $30 to $50. "
     The little boy     5     in his pocket and pulled out some     6   "I have $2.37,"he said,"     7    I please
look at them?"
      The store owner     8     and whistled and out of the kennel (狗窝) came a lady dog,who ran down the
aisle(过道) of his store,   9     by five puppies. One puppy was     10   . Immediately the little boy singled
out the puppy and said, "What's     11     with that little dog?"
      The store owner explained that the veterinarian(兽医) had  12    the little puppy and had discovered
that it didn't have a hip socket. It would always walk slowly and with difficulty. It would always be lame.
The little boy became   13  "That's the little puppythat I want to buy. "
      The store owner said, "No,you don't want to buy that little dog. If you really want him,I'll just give him
to you. "
     The little boy got quite upset. He looked   14  into the store owner's eyes,pointing his finger and said, "I
don't want you to give him to me. That little dog is worth every bit as much as all the other dogs and I'll
pay     15    price.In fact I'll give you $2.37 now,and 50 cents a month     16    I have him paid for. "
       The store owner answered, "You really don't want to buy this little dog. He is     17     going to be
able to jump and play with you like the other puppies. "
      To his surprise,the little boy reached    18     and rolled up his pant leg to show a badly twisted,
crippled(残疾的) left leg   19   by a big metal brace(支架). He looked up at the store owner and softly
replied," Well,I don't run so well myself,and the little puppy will need someone who   20     !"