翻译:1.谈起那家公司的福利和工作条件，所有的职员都闭口不谈。（welfare） 
        2.总的来说，我们认为很有必要为地震的受害者捐款。（more than） 

修改一下:::1.那只用报纸包起来的瓶子里碰巧有治胃病的药（happen）
                 that bottle which was wrapped in newspaper happened to have the machine cured the stomach illness.
                 2.在旧社会，出身贫寒的人很少有受教育的机会。（chance）
                 in old society, the people who borned in poor home had few chance of being educated.
                 3.尽管老师一再给孩子门解释游戏规则，一些粗心的孩子在做游戏时依然忘的一干二净。（explain） 
                 although teacher gave children to explain the gave rules again  and again,when   played  games ,some  uncareful children remained to forget thoroughly.
                4.短暂的犹豫使他失去了赢得奥运会金牌的机会（cost）
               brief hesitating made him cost chance of winning the olympic games's gold medal.