Similar words: seventh heaven, heaven, heavens, heavenly, vault of heaven, heavenly bodies, move heaven and earth, heave.
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1. Heaven knows what's happened to them.
2. Heaven knows you've been working long enough.
3. He has Heaven knows how many wives.
4. Heaven knows they have enough money.
5. Heaven knows what they put in it.
6. Sue can't take a holiday yet[sentencedict .com], though heaven knows she needs a rest.
7. Take your shirt off - Heaven knows it's hot enough today!
8. He won't tell me what he thinks. Heaven knows why.
9. Heaven knows you all but need proof of insurance these days to get a haircut.
10. Kenyon must see it through or heaven knows what will become of the station.
11. Heaven knows how dealers can sell these cars at a profit.
12. Heaven knows what they say when they are really angry with some one.
13. He starts a conversation and ends up heaven knows where.
14. Heaven knows we need never be ashamed of our tears, for they are rain upon the blinding dust of earth,(sentencedict.com) overlying our hard hearts. Charles Dickens 
15. Heaven knows I've tried talking to him, but it gets me nowhere.
16. If it isn't, heaven knows who will ride to the rescue of the firm.
17. Heaven knows what his victim had been eating before the battle, but it ended Seiguard's reign of terror, permanently.
18. The just Heaven knows I am innocent of any.
19. Heaven knows how we shall repair his loss.
20. Dory! Heaven knows what you're saying!
21. Heaven knows I've tried to help.
22. Heaven knows where he fled.
23. And heaven knows we need that; most of us are way too myopic, constipated and chickenshit about fees.
24. This gained me some thinking time, and heaven knows I needed it.
25. If you get a job and I don't, heaven knows how much you'll bully me then!
26. Heaven knows I'm not.
27. Though the just Heaven knows that I am innocent of any.
28. People live together - Peter and Miranda are Bohemian enough, heaven knows.
29. People wave from the bank and shout our names; heaven knows who they are!
30. Our daily weather continues to dictate the trivial scenarios of our lives-and remains manna to the rag trade, the tourist industry, and heaven knows what else.
More similar words: seventh heaven, heaven, heavens, heavenly, vault of heaven, heavenly bodies, move heaven and earth, heave, leaven, penknife, heaves, heave-ho, leavening, unleavened, on the average, leave no stone unturned, unknown, banknote, gordian knot, unknowingly, a Gordian knot, with a heavy heart, think nothing of it, weave, eaves, leave, weaver, cleave, beaver, leaves.