...Then he swung quickly around and peered back, senses alert... 
Various 「Astounding Stories, August, 1931」
..."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」
...Then I started up alert again...
Anthony Hope 「The Prisoner of Zenda」
... Her lazy eyes were now alert to search that lean face of his...
Rafael Sabatini 「Scaramouche」
...Seeming only was the indifference of Tarzan, for alert and watchful wasevery well-trained sense...
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」
...The lad was too thirsty by now to cavil at anything even remotelyresembling water, so he drank his fill while Akut stood with raisedhead, alert for any danger...
Edgar Rice Burroughs 「The Son of Tarzan」
...The boy followed close upon his heels, his every sense upon the alert,his nerves keyed to the highest pitch of excitement...
Edgar Rice Burroughs 「The Son of Tarzan」
... Meriem was instantly alert...
Edgar Rice Burroughs 「The Son of Tarzan」
...But suddenly Jeanne was alert, and with her alertness came terror for the beloved...
Baroness Orczy 「El Dorado」
...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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