Someone was talking and now I could hear a sudden sharpness come into his tone.

He put doubt into his tone, feeling that the critical moment was at hand.

This time he injected a little good humor into his tone.

Kirk put into his tone a confidence of which he was far from certain.

She worked to keep a hold of it, but some crept into her tone, anyway.

She laughed again, a cruel edge coming into her tone.

He allowed scorn to come into his tone, for the first time ever.

She noticed he'd gone into his low, seductive tone again.

Keane smiled, and a bit of an edge came into his tone.

"There is an alternative," he said, trying to put some enthusiasm into his tone.