21.   Although union members agreed on Friday to return to class, both camps said they feared the bitterness would persist for weeks, if not months.

22.   An even greater gap persists for students of different races.

23.   Any patient whose heartburn persists for more than five years, he adds, should be given an endoscopy test to look for pre-cancerous cells.

24.   Asked why the Mexican government chose a case in Maine, Mexican embassy officials said the problems at DeCoster had persisted for years.

25.   Boeing said that overtime work required to meet customer orders cut productivity, and that overtime will persist for several months.

26.   A move above that price suggests that bonds are about to break out of the two point trading range that has persisted for five weeks, Alexy said.

27.   A small number of people will flounder and develop psychiatric symptoms that may persist for a long time.

28.   A trend, once in place, tends to persist for a quarter.

29.   A. I think it persists for complex reasons.

30.   After the pain persisted for two months, the doctors arranged for a brain scan, which showed two hematomas.