Via Derbyshire, who claims to have gotten eighteen right. My guesses (not open book, with Firefox spellcheck temporarily disabled) are over the fold. I haven’t checked to see what my score is, but someone else can, if they have the time.
1. ass-uh-9
2. brag-uh-doe—C-O
3. rare-uff-I
4. lick-wuff-i
5. puh-vill-yun
6. ver-mill-yun
7. im-pah-stir
8. mock-uh-sun
9. uh-komuh-date
10. kon-sen-sus
11. roe-ko-ko
12. tittle-8
13. sack-ruh-lijus
14. may-uh-naze
15. im-pray-sorry-O
16. in-ock-U-late
17. sooper-seed
18. obly-gahto
19. dessuh-Kate
20. re-sussuh-tate
If you want to try it yourself, do it before looking at mine.