21.   Fatigue sabotaged the constant vigilance necessary to avoid infection.

22.   For them, keeping HIV at bay would require constant vigilance and a full medicine cabinet for life.

23.   Greenspan said constant vigilance was necessary to prevent an acceleration in inflation.

24.   In a sign of the constant vigilance of his reelection effort, they warily scanned the news wires and sounded an alarm indicating incoming fire.

25.   It frees his mind from the constant vigilance and inevitable defeat that come with trying to maintain expensive pieces in a busy household.

26.   It demands constant vigilance.

27.   It requires constant vigilance and surveillance.

28.   It takes regular visits from the exterminator and constant vigilance on the part of the homeowner.

29.   It takes constant vigilance to always put the best face on things, to get doubters to agree that things are the way you say they are.

30.   It takes constant vigilance.