11.   They stop unfamiliar pedestrians and motorists, asking for identification and turning away anyone who does not live on the block or have a convincing reason to be there.

12.   Americans have been given no convincing reason why U.S. warplanes are bombing the Kosovo province of Serbia, one of the parts of the Yugoslav federation.

13.   BP-Amoco will presumably also fail to offer convincing reasons.

14.   However, an equally convincing reason is that the cellphone ringing tones can be distracting and irritating.

15.   On Thursday night, the governor said he saw no convincing reason to grant clemency for Rose.

16.   Rwanda has the most convincing reason to fight.