1.   I have used Marin Oomed, but the problem persists.

2.   If the problem persists, they are replaced.

3.   She says she has had the chimney swept, but the problem persists.

4.   Should the problem persist, find an effective anti-dandruff shampoo.

5.   The fact that the problem has persisted throughout this century indicates that its roots are deeper.

6.   These problems persisted for much of the decade.

7.   Although things appear stable, problems persist that even Beethoven cannot fix.

8.   Although his recovery from substance abuse began after his release from prison, his health problems persisted.

9.   And even though the Russians have kept their subs close to home since the Cold War ended, problems persist, often because of poor maintenance and training.

10.   And he wonders why his image problem persists.