...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」
...“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」
...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 became alert and brisk, went so far as tolerantly to commend Captain Blood's plan, and issued orders that action might be taken upon it at once...
Rafael Sabatini 「Captain Blood」
...His mind was all intent upon the advancing troop, his wits alert and gathered together for a leap in whatever direction should be indicated...
Rafael Sabatini 「Scaramouche」
... Beside them, and opposite each other, stood Le Chapelier and the young captain, alert and watchful...
Rafael Sabatini 「Scaramouche」
... 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」
... 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」
...Immediately Tarzan was alert...
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」
... 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」
... Instantly she was all alert...
Edgar Rice Burroughs 「The Son of Tarzan」
...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」
...Mahina,however, was on the alert, and had seen nothing; and although I lookedcarefully round us on all sides, I too could discover nothing unusual...
J. H. Patterson 「The Man-eaters of Tsavo and Other East African Adventures」
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