答案：He didn't give up smoking until
通过对比，可知英文句子中缺少"直到病得严重了，他才戒烟"的完整表达；根据从句he was seriously ill结合汉语意思可知此处应该用固定表达not…until"直到…才"引导一个时间状语从句；从句为一般过去时，所以主句也应为一般过去时；"戒烟"应该用固定短语give up，后跟动名词smoking；give up为动词短语，所以应用助动词did加not即didn't表达否定，后跟动词原形；即He didn't give up smoking；后加上连词until．故填：He didn't give up smoking until
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