The strong man must at all times be alert to the attack of insidious disease.
And accordingly, when he wakened in the middle of the night, he was alert on the instant.
He moved with alert assurance, lithely balanced on the balls of his feet, noiselessly.
Instantly, he was all alert to meet the exigencies of the situation.
With narrow, alert eyes, Linda was watching, and her brain was keenly alive.
Then she sat down in the corner of the sofa, exhausted but alert.
Let us hope that the authorities of Toulon were equally on the alert.
The reports of the rifles and cannon kept every one alert and watchful.
He knew that he must be calm, but alert and quick with the right answer.
Everything seemed so reasonable, that all were prompt and alert to serve him.