What's Next?

Some puzzle I've got from forgotten book, I mean the book's title. Solve it then ....

1. 1 3 5 7 ___
2. AB CE CD EG EF G___
3. blowhard hardhat hatcheck ___
4. astray stray tray ___
5. toner tone ton ___
6. stone tone ton ___
7. stops ___ top to
8. snit in snot on prod or mode ___
9. polygram 12345678 pray 1674 play ___
10. gum gun bar bat sun sup lip ___
11. 791399248856872155614___
12. QOMKI___
13. din don fan fen pep pip cod ___
14. 289735 897352 973528 735289 ___
15. bib bib ton not 399 993 pin ___
16. JK KJ LM IH NO G___
17. 372102199031 487373522099 47391___
18. retire rite strafe fart inept pen peruse ___

Well, some solved, some not yet. Let's play!