11.   The only nagging worry is about their future employment opportunities.

12.   The volcano, however, is still a nagging worry.

13.   Gains have been limited, however, by nagging worries that economic policy will be held hostage to the same type of political haggling that dogged the outgoing administration.

14.   Secession was a nagging worry for Alana Sullivan as she voted.

15.   Wexler emerged from the experience still single, and that remains a nagging worry for his self-appointed matchmaker.