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 ______________________ is a quality of human condition. We are born one time only; we can never start a new life equipped with the experience we've gained from a previous one. We leave childhood without knowing what youth is; we marry without knowing what it is to be married; and even when we enter old age, we don't know what it is we're heading for: the old are innocent children of their old age. In that sense, man's world is the planet of______________.

① Chance      ② Fortune        ③ Inexperience        ④ Happiness       ⑤ Misfortune