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【简答题】

a person who performs or offers to perform a service of his or her own free will v ( )

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【简答题】The group, which wants to pr cruelty to animals, is against ( ) in medical labs.
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【简答题】( ) a catastrophe often makes one more sensitive to the positive aspects of life.
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【简答题】He ( ) to go, and nothing will stop him.
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【简答题】The　 ( ) 　has finally gotten me today.
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【简答题】A　 ( ) supplement is needed by people who do not consume a proper diet.
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【简答题】After a day’s work, he was extremely tired. He came home and　 ( ) 　on the sofa immediately.
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【简答题】A　 ( ) 　part of any health program is exercise.
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