I shake off these terrible thoughts and try to concentrate on the book before me.

She again breathed deeply and concentrated upon the figure standing before her.

She had stood concentrating on the area before her, afraid even to blink.

The two characters concentrate intently on the task before them.

You truly only need to concentrate for about a 10-second span before and during the shot.

He concentrated every sense on the blur of light along the tunnel wall before him.

Banks shook off the memory and concentrated on the scene before him.

But he needed to concentrate on the problem before him.

Random turned his head away and concentrated on the cliff face before him.

With the remains of his force he concentrated before Alessandria on the 12th.