题目内容：
Questionsare based on the following passage.Men who bottle up their anger at being unfairly treated at work are up to five times more likely to 47 a heart attack, or even die from one, than those who let their 48 show a Swedish study has found.
The study followed 2,755 employed men who had not suffered any heart attacks from 1992 to 2003. At the end of the study, 47 ~ 49 had either suffered an attack, or died from heart disease, and many of those had been found to be "covertly coping" with unfair _50_ at work, "After adjustment for age, socioeconomic factors, risk behaviors, job _51 and biological risk factors at baseline ( 基线 ), there was a close-response relationship between covert coping and the risk of incident myocardial infarction (心肌梗塞 ) or cardiac death," the study's authors wrote. Covert coping was listed as "letting thing pass without saying anything" and "going
away" _52_ feelings of being hard done by colleagues or bosses. Men who often used these coping techniques had a two to rivefold higher risk of developing heart disease than those who were more. _53_. at work, the study showed.
The researchers said they could not answer the question of what might be a particularly healthy coping 54__ at work, but listed open coping behavior when 55__ unfair treatment or facing a56_ as "protesting directly," "talking to the person right away," "yelling at the person right away" or "speaking to the person later when things have calmed down."
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请作答（47）______
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