"Those you seek are within the walls," said the hollow voice.

When his hollow voice broke silence, they all three started.

"Whatever that means," said a hollow voice from the crowd.

After a long moment, he spoke in a hollow voice.

It was just then that a weird and hollow voice inside me said stop!

"I should have made an effort," he said in a hollow voice.

He spoke in such a hollow voice that the girls felt quite scared.

And he'd said it in such a sad, hollow voice.

"There may be time," said the hollow voice, and gave the order to attack.

That response was, once again, delivered in a flat and hollow voice.