1.   But trying to get the man out of the car proved impossible.

2.   Solving the three classic problems this way has been proved impossible.

3.   Then the game began and the wheels started turning and John Boles, that bug-eyed bandit, proved himself impossible to ignore.

4.   When the pair of harlequin suede pants he was enamored of proved impossible to button, he kneeled down and with enormous effort got them closed.

5.   The company is hoping to sell the stores but may close them down if a sale proves impossible, Adler said.