71.  As a confirmed haggis lover, that just proves how irrational we humans can be!

72.  As a message about debt repayment, it proved far more effective than a letter writing campaign.

73.  As eggplant spread west, though, bitterness proved an obstacle to acceptance.

74.  As events would prove, it was a frail umbilical cord from the customer to design and manufacturing.

75.  As existing dominant males age so doubtless can the collaborative attacks of younger animals prove increasingly effective.

76.  As far as Poulton was concerned, the fact that many animals possessed protective coloration proved the effectiveness of natural selection.

77.  As if to prove the point, some of those crying nepotism loudest are themselves close members of the family.

78.  As proved by history, women are the ones who have to pick up the pieces in the aftermath of war.

79.  As some one who likes musical comedies to be comedies, the frivolity of this piece proved irresistible.

80.  At first simply managing to grab the feet will prove to be an effort.