...And the engineer said this in such a peculiar voice that it wasdifficult to know whether he spoke seriously or not... 
Jules Verne William Henry Giles Kingston 「Abandoned」
...The night passed, and whether the prisoner slept or not could not beknown; but at any rate, although he had been unbound, he did not move...
Jules Verne William Henry Giles Kingston 「Abandoned」
...Any of the Selom could operate on you, but Idoubt whether Jumor himself could do it successfully on me without aidfrom power...
Various 「Astounding Stories, August, 1931」
..."You will be examined whether you submit willingly or not," repliedAstok...
Various 「Astounding Stories, August, 1931」
...Sight andscent became remarkably keen, while his hearing developed such acuteness thatin his sleep he heard the faintest sound and knew whether it heralded peace orperil...
Jack London 「The Call of the Wild」
...Buck did not like it, but he bore up well to the work, taking pride in it afterthe manner of Dave and Sol-leks, and seeing that his mates, whether they pridedin it or not, did their fair share...
Jack London 「The Call of the Wild」
...He did not know whether Buck could start a thousand pounds...
Jack London 「The Call of the Wild」
...” Add to allthis his vital energy and mental activity, his restless invention and hissanguine temperament, and there will be reason enough to doubt whether hiscould have been a very unhappy life...
Miguel de Cervantes 「The History of Don Quixote, Vol. I, Complete」
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