In the first three units, the audio is also available for the examples in the explanations of rules. The audio was put onto the pictures of book pages. Since the pictures were converted from the pdf file, they might be a bit blurry.
Answer key p 21
2 Vowel harmony 22
Answer key p 29
11 is an introductory unit (to ek-fiil) with no exercises.
18 is an introductory unit (to the verb tenses) with no