1.   The effort proved too much for her weak heart.

2.   The nymph attempted a final arabesque but the effort proved too much for her weak heart.

3.   When efforts to persuade them to go proved fruitless, the building began to be demolished around their heads.

4.   All our efforts proved futile.

5.   And when his efforts that day in Miami proved to be too little too late, he embodied the demise of the pre-merger pro football establishment.

6.   Both efforts proved fiascoes and helped usher in Republican rule of the House and Senate.

7.   All such efforts proved futile.

8.   Alas, all these heroic efforts have proved fruitless.

9.   Also in the United States, missionary efforts proved to be an outlet for the creative energies of women.

10.   But his effort proved counter-productive.