heaven knows what my immigrant grandparents made of the book, if they read it at all.
Hurtling through the sky on the way to heaven knows where is an altogether new hazard.
“heaven knows when he fitted it all in,” says Professor Beard.
heaven knows, Wilson, when and where shall be our next meeting.
heaven knows to what lengths their malignity will then carry them.
I suspect I was when I was perplexed, and heaven knows that very often my perplexity was extreme.
heaven knows I had been sufficiently tormented by their persecutions to know them.
heaven knows when I'll see another swell audience mobbing one of my attractions!
If we had not said that till the evening, heaven knows what might not have happened.
Germaine, heaven knows, if I could do anything for you, I would!