...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」
..."We must only keep on the alert, and not change ourencampment for a safer one until those return who remainedalive in the castle...
Antonio de Trueba Henry J. Gill 「The Cid Campeador」
...Tarzan had slept for perhaps an hour or two despite the savage din ofthe revellers when his keen senses came suddenly alert to asuspiciously stealthy movement in the hut in which he lay...
Edgar Rice Burroughs 「The Beasts of Tarzan」
... An alert anddaring brain figured upon the chances of success when a certain planshould be put to the test...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...Seeming only was the indifference of Tarzan, for alert and watchful wasevery well-trained sense...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
... For a half hour the torrentsfell—then the sun burst forth, jeweling the forest with a millionscintillant gems; but today the ape-man, usually alert to the changingwonders of the jungle, saw them not...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...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」
...A slight noise in the jungle upon the opposite side of the clearingbrought Achmet Zek to immediate and alert attention...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
... He was, upon theinstant, another creature—wary, alert, ready...
Edgar Rice Burroughs 「The Son of Tarzan」
... Meriem was instantly alert...
Edgar Rice Burroughs 「The Son of Tarzan」
... the alert mind...
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」
...He had taken a fancy to the alert, ready little fellow...
Anthony Hope 「Rupert of Hentzau」
...Ourwomen too were in my eyes at least uncommonly graceful, alert, andmodest to a degree of bashfulness; nor do I remember to have everheard of an instance of incontinence amongst them before marriage...
Olaudah Equiano 「The Interesting Narrative of the Life of Olaudah Equiano, Or Gustavus Vassa, The African」
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