"the american south/north" is weird to me. Are those correct?
"What do you know about south America?" - I think this makes the most sense ...
No correlation between most of the recordings and texts in this lesoon
You can report this error by clicking the "Report a Problem" button under the sentence during the practice. I think, it has more chances to be fixed faster then.
I have no idea why the endings are as they are - an i or not - grammar obviously what cases are being used and why ?