1.  A brilliant word-processor proving shareware can push back the boundaries of software value for money.

2.  A careful note should be made against any sub-contractor used by the builder who subsequently proved to be unsatisfactory.

3.  A cure for the disease has proven to be elusive.

4.  A few other metal objects had been fired, such as clocks and hair brushes ... but they had proved quite useless.

5.  A man-made clock would certainly prove a useful accessory to astronomical reckoning but could never stand in its stead.

6.  A mixture of consultation and internal management control might well prove a better starting point.

7.  Where there is no call for a continued food market, market buildings have proved highly adaptable.

8.  A recently acquired photo-copier has proved a great time-saving boon for note taking.