He kept his tone light, but she felt the change of mood.

She bent down to kiss his cheek and tried to keep her tone light.

"Forget the money," she said, trying to keep her tone light.

She kept her tone light but felt on the edge of tears.

He tried, successfully this time, to keep his tone light.

"Already did," he said, working to keep his tone light.

Despite the pressure to squeeze so much in, he tries to keep the tone light.

Well, maybe not that sorry, she said, her tone light.

"Nice of you to ask," she said at last, keeping her tone light.

It took great effort to keep his tone light.