31.   Drug dealers used to ply their trade openly there.

32.   During the Taliban era, he plied his trade on undercover missions, defying an edict against owning, selling or fixing that potent symbol of Western decadence.

33.   Drug dealers and prostitutes flagrantly plied their trades up and down decrepit corridors.

34.   Ever since the first unguentarii plied their trade in Roman Capua, perfumers have had to keep abreast of changing fashions.

35.   Existing law allows the felony prosecution of prostitutes who are infected with HIV and continue to ply their trade.

36.   Ever wonder about those teen-age boys you see loitering along the Hollywood stretch of Santa Monica Boulevard, plying their trade from the time the sun comes up?

37.   For those who have watched Cal Ripken Jr. adeptly ply his trade, his incubation in the major league environment was obvious.

38.   Hai assiduously courts her by offering her free rides from the luxury hotels in which she plies her trade.

39.   Growing up, he watched his father ply his trade as a woodworker and his brothers souping up their hot rods.

40.   He can ply his trade without stifling scrutiny.