61.  And to prove we mean business, our members will stage a one-day strike next week.

62.  And we ought, in fairness, to wonder who else in similar circumstances would have proved so much bolder?

63.  And what worked for a partnership proved disastrous in a publicly owned corporation.

64.  And why has the determined search for alternatives proved so fruitless?

65.  And yet, his professors insisted, their entire history proved they were.

66.  And yet, the most sophisticated experiments have proved quantum theory correct time after time.

67.  And, whether you are at the communication source or its destination, this book proves fascinating reading.

68.  Anderson proves himself a fascinating and adventurous composer as well as a virtuoso bassist in this superlative album.

69.  Animal research has proved of little value in the past and will continue to hinder medical progress in the future.

70.  Around fifteen thousand spectators came to watch the thrills and spills ... for the organisers it proved another successful Classic.