"It is all right," I said, and had time to note how my voice had assumed a professional tone.

And suddenly his voice assumed a bitter and angry tone.

"You have round ears," she said, her voice assuming a soft, strange quality.

The voices of both author and reader assume great importance in a recorded book.

I shook my head in response, amazed at the stem tone his voice had briefly assumed.

When he finally did, his voice had again assumed a flat and official tone.

His voice assumed the tone of a patient master.

Finally he spoke, and his voice, in English, assumed an unusual harshness.

"Many people have done it," he said, his voice assuming a tone of special confidence.

His voice assumed the slightly higher pitch he used in class.