Answer:
2. An oil spill has been reported in Mexico.
3. The robbery took place during the early hours this morning.
4. The player has not been selected for the Olympic team.
5. Dinosaurs may have been wiped out when an asteroid hit earth.
6. A climber who fell 100 feet down a steep ridge is recovering well.
7. It is expected that there will be an announcement on tax increase tomorrow.
8. There are no witnesses.
Participles have two forms - they either look like verbsing, or like past form of a verb (adding -ed to regular verbs, or third column of irregular verbs). They often function as either adjectives or adverbs in a sentence. So, having that in mind, the only participle in this sentence is the word excited, and it modifies the noun friend. The friend was excited, which is why the latter word modifies the former.
A. Pepper and i decided it was time to head home.
