r that, my father began telling us about his days as a firelighter, and my brother and I became___34___, asking him what other jobs he had done before he___35___. Well, it turned out that he had done just about___36___except brain surgery!РHe had been in the military as a carpenter, carpet layer, and electrician, and had built B2 bombers before being poisoned in an accident that had___37___him to retire. My father has a blood disorder as a result of that___38___, but that hasn’t stopped him form being a full-time electrician.РTo all those people whose fathers have worked in the military and in other dangerous jobs, be___39___of them, and remember that some day their___40___might save your life.Р21. A. prevented B. permitted C. witnessed D. startedР22. A. because B. unless C. after D. until