This sentence is talking about <u>one</u> dog. The sentence really doesn't make sense (since one dog including the new puppy means the new puppy was the one doing the eating, making this more of a concision issue), but "one of the dogs" is singular and goes with "is" rather than "are".
Hi! I just finished this lesson. Here are the answers....
1. C- to show how Jeremy finds the real world awkward and embarrassing
2. B- occurs repeatedly over time
3. C