I think it would be the one from paragraph 4, it shows laura has overheard what they were talking about and her mood changes and feels hurt
General Zaroff avoids the trap Rainsford sets.
The participle is "digging." Most participles end in -ing. It modifies "man", describing what the man is doing.
Cave is a smaller section of a cavern. A song is a smaller part of a tune. Therefore, one is the bigger picture (second section) and the other is the smaller picture (first one) Hope this helps!