In the sentence provided, "Racers, start your engines" the word <em>Racers</em> represents a noun of direct address.
These nouns of direct address are defined as words that name a person, places, things or ideas. In the particular case of the sentence provided this name (Racers) reffers to the persons who are taking part in the career.
Answer:
because she didn't have a car?
Explanation:
Answer: Cassie will never understand what Paul is going through.
Explanation: She just keeps talking but not understanding.
Answer:
the memory of the daffodils can bring him happiness .
Explanation:
happiness is a state of mind is never really real there is no way to be truly happy without flowers nearby.