Greyhound racing is the sixth most【C1】p______ spectator sport in the United States. Over the last decade, a growing number of ra

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问题
    Greyhound racing is the sixth most【C1】p______ spectator sport in the United States. Over the last decade, a growing number of racers have been【C2】 to spend their retirement as household pets, once their racing careers are over.
    Many people hesitate to adopt a retired racing greyhound because they think only very old dogs are【C3】ava______. Actually, even champion racers only work until they are about three-and-a half years old. Because greyhounds usually live to be 12 to 15 years old, their retirement is much【C4】than their racing careers.
    People worry that a greyhound will be more【C5】(nerve)and active than other breeds and will need a large【C6】sp______to run. These are false impressions. Greyhounds have naturally sweet, mild dispositions, and while they love to run, they are sprinters rather than distance runners and are【C7】(sufficiency)exercised with a few daily laps around a fenced-in backyard.
    Greyhounds do not make good watchdogs,【C8】they are very good with children, get along well with other dogs(and usually cats as well), and are【C9】(affection)and loyal. They are intelligent, well-behaved dogs, usually housebroken in only a few days. A【C10】re______ racing greyhound is a wonderful pet for almost anyone.
【C7】

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解析 修饰过去分词exercised应该用副词。
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