1.   The friendship tunnel became a well-worn path - what with all the to-ing and fro-ing of furred and feathered visitors.

2.   The light faded away and the tunnel became completely black.

3.   But opponents of the plan are certain that the test tunnel will soon become the real thing.

4.   The Channel tunnel became operational last year.

5.   They make maintenance of utility lines convenient, but building and insulating tunnels quickly became cost-prohibitive.

6.   The tunnel became the spark that turned deteriorating Israeli-Palestinian relations into a deadly conflagration.

7.   The tunnel finally became free of smoke yesterday, more than a day after the fire that destroyed the Kitzsteinhorn cable car.

8.   The tunnel finally became free of smoke Sunday, more than a day after the fire that destroyed the cable car.

9.   The tunnel finally became free of smoke Sunday, more than a day after the fire that destroyed the Kitzsteinhorn cable car.

10.   Until the tunnel became available Rover cars had crossed the Channel by ferry from Dover to Dunkirk.