So, supposing I tried, the task would demand total concentration.

Like much else on the 120-item menu, it demands earnest concentration.

"Silent films have a lot going against them, because they demand so much concentration and emotional involvement," he said.

I always thought the big pack was more exciting, it demands total concentration for the entire race.

I had never done anything that demanded so much concentration.

The sweet demanded serious concentration; the colonel took the card and studied it.

The players are all in confident mood and they know I demand 100% concentration on this task.

There was something in the back of my mind, something demanding concentration.

Yet it is complex enough to demand extreme concentration, trying always to be in the right place.

I shook away the spell the dance had put me under, demanding concentration from myself.