Ms.Sue is this right?

Question

1)The puppy came (to our tent) and slept (at the foot) (of my sleeping bag).

2)A skywriter flew (over the field) (during the game).

3)The city was (without power) (for several hours)

4)The cross-country team ran down the avenue and through the park.

Answer 1

You have correctly identified the prepositional phrases in the first three sentences, yes.

How about the fourth sentence?

And which words are the subjects?

Answer 2

down the avenue
through the park