...He held himself alert,ready, if need be, to struggle up from the moist crevice and dart onfurther into the bush... 
Various 「Astounding Stories, August, 1931」
...Then he swung quickly around and peered back, senses alert...
Various 「Astounding Stories, August, 1931」
...Buck hurried on,swiftly and stealthily, every nerve straining and tense, alert to themultitudinous details which told a story—all but the end...
Jack London 「The Call of the Wild」
..."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」
...“Ah! my dear lady, pardon me, but that is just what we cannot very welldo,” said Chauvelin, whilst once again his eyes, keen as those of a foxon the alert, darted a quick glance at Marguerite...
Baroness Orczy 「The Scarlet Pimpernel」
...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」
... She did not realize how far she and Gazan hadbecome separated from the balance of the tribe, nor were her defensivesenses upon the alert as they should have been...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
... Nor wasit long before the ape-man came upon Bara standing alert at the edge ofa moon-bathed clearing...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
...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」
... He was, upon theinstant, another creature—wary, alert, ready...
Edgar Rice Burroughs 「The Son of Tarzan」
...He had taken a fancy to the alert, ready little fellow...
Anthony Hope 「Rupert of Hentzau」
...His breathing was quick and distressed, gasp tumbling over gasp, but still his eye was alert and his hand unerring...
Anthony Hope 「Rupert of Hentzau」
...The uneasiness of the trader was continually showing itself, and, upon the whole, he had reason to be on the alert both day and night...
David Livingstone 「Missionary Travels and Researches in South Africa」
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