v. 25B6; verb
the problem will remain : CONTINUE TO EXIST, endure, last, abide, carry on, persist, stay (around), prevail, survive, live on.
he remained in hospital : STAY (BEHIND/PUT), wait (around), be left, hang on; informal hang around/round; Brit. informal hang about; archaic bide.
union leaders remain sceptical : CONTINUE TO BE, stay, keep, persist in being, carry on being.
the few minutes that remain : BE LEFT (OVER), be still available, be unused; have not yet passed.