..."It is certain that a gun has been fired in the island, within threemonths at most... 
Jules Verne William Henry Giles Kingston 「Abandoned」
..."No, my dear Spilett, but you see that if it is certain that a humanbeing set foot on the island, it appears no less certain that he has nowleft it...
Jules Verne William Henry Giles Kingston 「Abandoned」
...However, before returning to the dockyard, Cyrus Harding conceived theidea of fabricating certain machines, which greatly excited thecuriosity of his companions...
Jules Verne William Henry Giles Kingston 「Abandoned」
...It was certain that the bridge had beencrossed, that the shore had been invaded by animals, and that whateverthey might be they could by ascending the left bank of the Mercy reachProspect Heights...
Jules Verne William Henry Giles Kingston 「Abandoned」
..."And you are quite certain of having seen this fire?"...
Jules Verne William Henry Giles Kingston 「Abandoned」
...Prepare the way anddon’t ask until you find she is unpledged, remember;or at least tarry long enough to bereasonably certain...
James W. Donovan 「Don't Marry」
...Whole regiments of the National Guard were wiped out as they foughtoff the weed with ax and bayonet, in the effort to provide time forthe refugees to clear from their homes in certain localities...
Various 「Astounding Stories, August, 1931」
...Each fall, when the Yeehats follow the movement of themoose, there is a certain valley which they never enter...
Jack London 「The Call of the Wild」
...“On that head I am not quite certain,” answered Don Quixote, “and thematter being doubtful, pending better information, I say thou mayestchange them, if so be thou hast urgent need of them...
Miguel de Cervantes 「The History of Don Quixote, Vol. I, Complete」
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