Thank heavens, it's cooled off a little.

谢天谢地, 天气总算凉了。

I would be grateful if you would come to your senses sooner rather than later.

你要是能早恢复理智我就谢天谢地了。

Thank heaven she didn't recognize me."muttered Father,mopping his face with a hankerchief."...She was a loverly young thing,very graceful.

谢天谢地，她没认出我来，”亲小声说道，面拿手帕擦擦脸。