21.   But Burnley said the district was just scratching the surface of potential revenue.

22.   But he said the complaints just scratched the surface.

23.   But in another sense, health officials were just scratching the surface.

24.   But James soon discovers that they have barely scratched the surface of weird.

25.   But that only scratches the surface.

26.   But that, too, just scratches the surface.

27.   But the games only scratch the surface of what is possible using a networked, three-dimensional environment.

28.   But the image only scratches the surface.

29.   But the next treasury secretary faces formidable problems, and the confirmation hearings Wednesday only scratched the surface, with the senators largely concentrating on domestic issues.

30.   But the presidential campaign hardly scratches the surface of political giving in Beverly Hills.