[解析]
76.Where have you been.根据下一句:我去医院了.故填Where have you been?.
77.Well.考查文章的理解和上下文的联系,可知此处应该是:嗯.故填Well.
78.What happened to her.根据下一句:她骑自行车时摔了胳膊.故填What happened to her?
79.Yes.考查文章的理解和上下文的联系?可知此处应该是:是的.故填Yes.
80.I really hope Cathy will get better soon.根据上面文章知道凯西住院了.故填I really hope Cathy will get better soon.