阅读下面短文，从各题A、B、C三个选项中，选出可以填入空白处的最佳答案。
According to a review of evidence（证据） in a medical journal, runners live three years 21 than non-runners. You don't have to run fast or for long 22 the benefit. You may drink, smoke, be overweight but can still reduce your risk of 23 early by running. While running regularly can't make you live forever, the review says it 24 more effective at lengthening life 25 walking, cycling or swimming. Two of the authors of the review also made a study published in 2014 26 showed a mere five to 10 minutes a day of running reduced the risk of heart disease and early deaths from all 27 .
The best exercise is the one that you enjoy and will do. And I think it's probably running. To avoid knee pain, you can get good running shoes first, run on soft surfaces, then avoid high hills when you do exercises. Running can help to 28 our leg muscles(肌肉). Running is cheap, easy and it's always 29 . If you are time poor, you need to run for only half the time to get the same benefits as other sports, so perhaps we should all give 30 a try.
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21. A. long
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B. longer
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C. longest
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22. A. see
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B. seeing
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C. to see
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23. A. dying
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B. die
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C. to die
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24. A. is
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B. has been
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C. will be
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25. A. by
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B. with
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C. than
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26. A. what
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B. which
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C. who
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27. A. cause
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B. reason
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C. causes
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28. A. strength
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B. strengthen
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C. strong
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29. A. energetic
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B. energy
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C. energetically
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30. A. run
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B. running
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C. ran
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