The audio really sounds like "fá" instead of "fák" to me :/
Because the next word starts with a k. In this case you say a long k ("kk") and not two short ks with a break ("k k").
Not among the trees and by the mountain acceptible?
I reiterate my previous comments about the placement of prepositional phrases... my respone should have been accepted.
You do know the producers of this course don't read the forum.
By the mountain? What does that mean?
Could "vannak" be used instead of "állnak" in this sentence?