"bombers were put on alert during the crisis"
"caught by a couple of alert cops"
"alert enough to spot the opportunity when it came"
"constantly alert and vigilant, like a sentinel on duty"
"a brisk walk in the park"
"a lively gait"
"a merry chase"
"traveling at a rattling rate"
"a snappy pace"
"a spanking breeze"
"an alert mind"
"alert to the problems"
"alive to what is going on"
"awake to the dangers of her situation"
"was now awake to the reality of his predicament"
"The empty house alarmed him"
"We alerted the new neighbors to the high rate of burglaries"
The villagers alerted the traveller that wolves might come out in the night.
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