阅读下面短文,从短文后各题所给的 A、B、C 和 D 四个选项中,选出可以填入空白处的最佳选项。
There was a bookseller who did not like to pay for anything. One day a big box of books fell(掉) on his1.
His wife asked him to see the2and show it to him.
"No," he said, "I'll wait3he comes to our shop next time. Then I'll ask him4my foot. If I go to see him, I shall have to5."
The next day the doctor came to the shop6 some books. The bookseller told the doctor about his7foot. The doctor looked at it and then took out a piece of paper and wrote8 on it. "Buy this and put it on the foot before you go to bed every night." he said.
"Thank you," said the bookseller. "And now, sir, here are your9."
"How much?" asked the doctor.
"10."
"Good," said the doctor. "I shall not have to pay you11today."
"12?" asked the bookseller.
"I have examined(检查) your foot. I want two pounds13that. If people come to my house, I ask them to pay one pound for a small thing like that14when I go to their houses, I usually charge (索价) two pounds. And I15here today, didn't I? "