11.   I had a nagging doubt in the back of my mind.

12.   Years of experience have left him with nagging doubts about the seemingly perfect customers.

13.   An appealing actor, Kevin Anderson, stars as an unconventional Catholic priest who balances his nagging religious doubts with an idealistic devotion to his inner-city parishioners.

14.   At this point Sullivan wades downstream, leaving Brandt with the nagging doubt as to which one of them actually caught the fish.

15.   But a nagging doubt remained.

16.   But just as the nagging doubts began to settle in, the sun knifed through the clouds, casting an Emerald City iridescence over the new Beck building.

17.   But others say that although they are impressed with the data, they are left with nagging doubts.

18.   But nagging doubt has to linger.

19.   But there have always been nagging doubts.

20.   Committing to a decorating scheme raises about as much nagging doubt as pledging everlasting devotion to another person.