"Hear me to the end," the Professor went on with a firm voice.

"I want to know everything," he said in a firm voice of command.

I said it in a firm voice without begging for help.

Then he pulled himself up and spoke in a firm voice.

When at last he spoke, it was to no one and to everyone, in a firm voice.

"You stay put," I told him in a very firm low voice.

"You know the rules of the house," she said in a quiet but firm voice.

"I just want to say I'm sorry that this happened," he told the judge in a firm voice.

The situation was saved by a light, firm voice calling from another room.

She asked the Professor in a firm voice if he would like to dance.