...Then he swung quickly around and peered back, senses alert... 
Various 「Astounding Stories, August, 1931」
...They were alert and active,anxious that the work should go well, and fiercely irritable with whatever, bydelay or confusion, retarded that work...
Jack London 「The Call of the Wild」
...It behoves you to be on the alert and keep watch, that they surprise you not...
Miguel de Cervantes 「The History of Don Quixote, Volume II., Complete」
...For some time she had been on the alert thinkingthat Desgas and his squad would soon overtake them, but these came from theopposite direction, presumably from Miquelon...
Baroness Orczy 「The Scarlet Pimpernel」
...” He would have sprung upon Captain Blood, who stood aloof, alert, tight-lipped, and watchful...
Rafael Sabatini 「Captain Blood」
... Binet maintained a firm hold of his young friend’s arm, and kept himself on the alert for any tricks that the young gentleman might be disposed to play...
Rafael Sabatini 「Scaramouche」
...Seen in thelight of that infamous lamp, he seemed a small, alert fellow, with a bushy,black moustache, and black hair parted in the middle...
John Buchan 「Mr. Standfast」
...His eyes, his ears and his keen nostrils were ever on the alert...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...Jane Clayton sat alert in the stern of the last canoe...
Edgar Rice Burroughs 「Tarzan the Terrible」
... He was, upon theinstant, another creature—wary, alert, ready...
Edgar Rice Burroughs 「The Son of Tarzan」
... Just for a moment or two they wrestledplayfully, until the scent of Sheeta, the panther, brought them totheir feet, alert and wary...
Edgar Rice Burroughs 「The Son of Tarzan」
... Meriem was instantly alert...
Edgar Rice Burroughs 「The Son of Tarzan」
...Having once walked out of this cell hale, hearty and alert, be the escort round him ever so strong, he never would have re-entered it again...
Baroness Orczy 「El Dorado」
...Tarzan wondered how long it would be before theycharged and while he waited he resumed his feeding, though withevery sense constantly alert...
Edgar Rice Burroughs 「Tarzan the Untamed」
... “You didn’t expect me?” cried Rupert, and in an instant the thought of a trap seemed to flash across his alert mind...
Anthony Hope 「Rupert of Hentzau」
...Had we not been very much on the alert,he would undoubtedly have got one of us, and we realised that we hadhad a very lucky and very narrow escape...
J. H. Patterson 「The Man-eaters of Tsavo and Other East African Adventures」
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