Преобразуйте, если это необходимо, слово REAL так, чтобы оно грамматически и лексически соответствовало содержанию текста. In 1785, Jean Pierre Blanchard used a dog to test his parachute design. The dog was fine, and so was Blanchard when he used the parachute in 1793 to escape a balloon accident. These early parachutes didn't catch on because there weren't any flying machines around to make them ___________ useful.

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Преобразуйте, если это необходимо, слово REAL так, чтобы оно грамматически и лексически соответствовало содержанию текста. In 1785, Jean Pierre Blanchard used a dog to test his parachute design. The dog was fine, and so was Blanchard when he used the parachute in 1793 to escape a balloon accident. These early parachutes didn't catch on because there weren't any flying machines around to make them ___________ useful.

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