阅读下列短文，从文后所给A、B、C、D四个选项中选出一个最佳答案。
John Thomas was an 18-year-old student, but he had been a famous champion (冠军).  Everybody at Boston University liked this tall, quiet boy. Once he was hurt, everybody at Boston University was  36  . People all over the country  37  about John Thomas and often asked, "Will he ever jump again ?"
John' s mother went to the hospital to see her son. She looked at his 38 leg. Then she looked into his  39  .She knew what her son would  40 . "You're going to jump again, John, I know it," she said. "  41  will be all right. "
If John hoped to jump again, he would have a  42  to do. He began at once. Even in his hospital bed John started to exercise. He used a wheel(轮子) and other metal things. Soon his  43  looked like a machine shop!
It was May when John  44  the hospital. "Is it all right if I go camping( 宿营) this summer?" he asked the doctors.
" Yes," the doctors said.  " But take it easy on that foot. "
John took only  45 walks at first. He was taking it easy on his foot. But not on anything else. He went swimming and did other kinds of exercises. He exercised  46  his body cried for a rest. Some days later, he exercised a little  47  . In late summer John went back to  48  . He asked if he could practise with the football team. Football wasn't his favorite, but he had to get that leg  49  again! He worked hard. "No one pushed him as hard as he pushed himself," said one of his friends. "To  50 a champion fighting back is a wonderful thing to watch. ":