11.   But some experts involved in the talks stressed that a scientific analysis of untested climate-control strategies says little about whether such efforts would prove effective.

12.   But that short effort proved too little, too late.

13.   But such efforts proved futile.

14.   But such prevention efforts have proved to be mere speed bumps, not roadblocks, in the path of HIV.

15.   But the scenes in which he voices his opinions in small, half-empty rooms are dangerously misleading because the Citizens Alliance efforts proved so effective.

16.   But the effort proved to be a bust in terms of how it played in court.

17.   But their efforts prove inconvenient to Dad, a true dead soul, and he turns murderous.

18.   Churchill said his own collection efforts proved his point.

19.   Effort proves fruitless.

20.   Four months later, his efforts have not proved successful.