Once there was a poor old woman. She lived by herself in a little house in a village. She didn’t have m_小题1:___ money but she was very kind.

One day a young man named Bill came to her d__小题2:__. He was very thin. He was very hungry and a__小题3:___ the old woman for help. The old woman said, “Come in and have dinner with me, but my dinner is only some potatoes.” They had d__小题4:__together. After dinner, the old woman told Bill to t _小题5:__ some potatoes with him. He thanked her and left.

Ten years later, Bill came b__小题6:_____ to the old woman’s door again and gave her a bag of m__小题7:____. She was surprised. Bill said, “Ten years ago you gave me some p_小题8:_____. I grew some potato plants. From those plants, I grew some more plants. Now I’m a r__小题9:__ farmer. But I never forget how k__小题10:__ you were to me.”

纵断面的设计线是由（）和（）组成的