严复翻译的《天演论》，其原文的题目是（）
Hesaidthatthegroup________himaletterandaskedhimtogothereforaninterview.
Ifyouarewalkingawayfromaclocktower，youwillhearthetickingoftheclockfadetoapoint________itcannotbeheard.
Perseveranceisakindofqualityandthatis_______ittakestodoanythingwell.