题目内容：

The snow was falling and the roads had become dangerous. The schools were dismissed early, but much to my surprise, my ____ wasn’t canceled. So I went, feeling especially heroic. As far as I could see, I was risking my life to keep my ____. Snow or no snow, I would be on time for my scheduled donation at the local ____ center.

When I got there, I discovered I wasn’t _____. Four more “hero-types” were already lying back in donor chairs with lines ____ to their veins, and machines quietly pumping away to ______ their lifesaving gifts.

Seeing my fellow donors honoring their own commitments, I realized why I was there. I lay back in my donor chair, ready to make a difference in the life of someone I would never _____.

To be honest, I’d never really thought about why I donate. I just do it. But a few months ago, during one of my ____ donations I learned that my blood was specifically for a cancer patient and for a newborn baby—both patients needed what I would give in order to live. I’ve viewed my visits to the blood center _____ ever since.

My wife Karen is a _____, too. And more importantly, she has been on the bone marrow (骨髄) list for fifteen years, ever since she signed up to provide bone marrow to a kindergartner with leukemia (白血病). That little girl died before Karen’s bone marrow could help her, ____ Karen was called again recently. Her test results were still on file, and it turned out she was a potential ____ for someone else. The caller asked Karen if she would still be willing to become a bone marrow donor. “Yes,” she said and then immediately began answering questions on the pages of paperwork for further testing. It was a race ____ time.

I wish I could say that this ____ was won. It wasn’t. The caller later thanked Karen for her participation and asked a few more questions—including whether or not she’d ____ on the donor list. “Of course,” Karen answered.

Last week Karen gave blood and next week I’ll make my usual donation. I’ll ____ an afternoon from my schedule and make an appointment. I don’t know whose life my donation may ____. Most likely it will be a ____, but on any day the person needing a blood product could be you or me or maybe a loved one. It is worthwhile to ___ our time to donate.

I really do feel _____ every time I donate. And I like the feeling.

1.A. appointment    B. class    C. meeting    D. flight

2.A. secret    B. balance    C. shape    D. word

3.A. service    B. shopping    C. blood    D. care

4.A. alone    B. welcome    C. late    D. lucky

5.A. exposed    B. attached    C. applied    D. added

6.A. examine    B. produce    C. collect    D. clean

7.A. meet    B. forget    C. miss    D. recognize

8.A. regular    B. unexpected    C. special    D. pleasant

9.A. wisely    B. differently    C. hesitantly    D. carefully

10.A. receiver    B. doctor    C. patient    D. donor

11.A. or    B. but    C. and    D. for

12.A. risk    B. customer    C. match    D. partner

13.A. beyond    B. with    C. against    D. of

14.A. honor    B. test    C. prize    D. race

15.A. rank    B. sign    C. appear    D. remain

16.A. clear    B. separate    C. lose    D. remove

17.A. touch    B. affect    C. create    D. enrich

18.A. child    B. stranger    C. hero    D. friend

19.A. spend    B. save    C. kill    D. take

20.A. empty    B. grateful    C. proud    D. nervous