One day，after school Bill walked past the shop on the street corner as usual．He stopped to look at the shoes in the window，and he felt sorry for himself．He really wanted to have a new pair for his birthday．
He sadly walked away and thought about what to say to his mother．He knew she would give him anything if she could．But he also knew she had little money．He decided not to go home at once，because he looked sad and he didn't want his mother to know about it．So he went to the park and sat on the grass．Then he saw a girl in a wheelchair（轮椅）．He found that the girl moved the wheels with her hands．Bill looked at her carefully and was surprised to see that the girl had no feet．He looked down at his own feet．"It's much better to be without shoes than without feet，"he thought．"It's not right for me to feel so sorry and sad．"He went away and smiled，thinking he was luckier in life．
阅读短文，回答下列问题
56．Why did Bill feel sorry for himself？
___
57．Bill had a poor family，didn't he？
___
58．Why didn't Bill go home at once？
___
59．Who did Bill see in the park？
___
60．What did Bill think at last？
___．
