题目内容：

I used to hate running. It seemed too hard, and expanding my comfort zone (扩大舒适区) was not something I like. In fact, I wouldn’t have become a runner if it weren’t for my husband Charles. He had been a serious competitive ______ for many years. After our marriage, he wouldn’t stop talking about how much he ______ it. So he picked it up again, and after about a year, I started to ______ him at the track. Just a few weeks later, Charles signed us ______ up for a five-kilometer race. I ______ about doing it because it was too soon.

The ______ sent a signal. Thousands of runners pushed forward. The first kilometer was ______. I was already breathing heavily and painfully aware of the group of runners ______ me. Charles was trying to ______ me, to get me focused on something _______my discomfort.

After another minute I saw the three-kilometer ______. “Painful” couldn’t _____describe how I felt. And there was pain, so much pain. I rounded a ______, and saw both sides of the street ______ with people watching the race, all ______ the runners up. I tried to keep my ______ going. I knew that if I actually ______ this race I would have achieved something. So, I ______ up and went on.

Finally I passed through the finish line. A volunteer put a medal around my neck. I ______ held my medal, walking to the post-race celebrations with Charles. My lungs and my ______ zone both expanded.

1.A. walker    B. runner    C. climber    D. swimmer

2.A. missed    B. regretted    C. forbade    D. selected

3.A. upset    B. tolerate    C. join    D. encourage

4.A. either    B. none    C. both    D. all

5.A. worried    B. complained    C. wondered    D. hesitated

6.A. gun    B. watch    C. player    D. candidate

7.A. unbelievable    B. easy    C. extraordinary    D. difficult

8.A. falling behind    B. passing by    C. laughing at    D. looking after

9.A. impress    B. encourage    C. comfort    D. upset

10.A. except    B. besides    C. including    D. like

11.A. line    B. notice    C. mark    D. end

12.A. once    B. ever    C. sometimes    D. even

13.A. corner    B. field    C. playground    D. river

14.A. crowded    B. covered    C. carried    D. faced

15.A. pushing    B. holding    C. cheering    D. turning

16.A. heads    B. eyes    C. legs    D. back

17.A. stopped    B. lost    C. failed    D. finished

18.A. came    B. straightened    C. gave    D. broke

19.A. carelessly    B. proudly    C. unwillingly    D. foolishly

20.A. sports    B. energy    C. health    D. comfort