Just for fun -- An audio reading of Ladle Rat Rotten Hut, which was written by an American linguist to demonstrate the point that, in English, vowel pronunciation is relatively unimportant for comprehension, at least in comparison to consonant pronunciation, syllabic stress, and phrase intonation.
That, of course, is very interesting and educational and everything. Although, all I have right now is a funny video but no feedback on how I did. Now I ended up asking myself whether I should work more on the current sounds or move on...