21.   Air pollution, especially ozone, was suggested but not proved as a possible cause.

22.   Also add Emma Thompson, who proves as crisp and indispensiably clever a screenwriter as she is a leading lady.

23.   But his strategy has proven as popular a cause in British Columbia as the restoration of salmon is south of the border.

24.   But so far, Betaseron has only been proven as a treatment for symptoms of the disease.

25.   But the annulments are proving as troublesome an issue in Judaism as they are in Roman Catholicism, where they have recently been under fire.

26.   But try proving as much, and then try showing that by undoing such practices, the government would be doing more good than harm.

27.   Chavez deserves a chance to prove himself as something more than Robin Hood.

28.   Daytime dancers proved just as entertaining.

29.   Dillon dealt with his doubt with a plan was to prove himself as an actor.

30.   He believed he had something to prove as a player, and came back to Maine.