11.   The Eritreans say that the problems had been festering for a long time.

12.   The result was governmental paralysis, as economic and social problems festered.

13.   These senior managers handled the important cases, but internal problems festered.

14.   These problems are festering.

15.   You just wait and let this problem fester for a while.

16.   Putting more pressure on Milosevic, the president of the only other republic in Yugoslavia, Montenegro, criticized him for allowing the Kosovo problem to fester.

17.   The pipeline problem has festered for months.