19. 주어진 문장이 들어갈 위치로 가장 적절한 것은?

If neither surrendered, the two exchanged blows until one was knocked out.
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The ancient Olympics provided athletes an opportunity to prove their fitness and superiority, just like our modern games. ( ① ) The ancient Olympic events were designed to eliminate the weak and glorify the strong. Winners were pushed to the brink. ( ② ) Just as in modern times, people loved extreme sports. One of the favorite events was added in the 33rd Olympiad. This was the pankration, or an extreme mix of wrestling and boxing. The Greek word pankration means "total power." The men wore leather straps with metal studs, which could make a terrible mess of their opponents. ( ③ ) This dangerous form of wrestling had no time or weight limits. In this event, only two rules applied. First, wrestlers were not allowed to gouge eyes with their thumbs. Secondly, they could not bite. Anything else was considered fair play. The contest was decided in the same manner as a boxing match. Contenders continued until one of the two collapsed. ( ④ ) Only the strongest and most determined athletes attempted this event. Imagine wrestling "Mr. Fingertips," who earned his nickname by breaking his opponents' fingers!

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