Left, had trekked, has visted, couldn't, bigger
Writing about something with the purpose of proving or disproving, clarifying, reviewing, or judging its merits is writing intended to "inform" since it seeks the truth. Of course "inform" and "persuade" go hand-in-hand quite frequently.
Answer:
Americains cellebrate the fall season in many ways. One way people do this is through Halloween. This is true because according to the text "Everywhere you walk..you might wonder why pumkins are apperaing on you neighbors porches."
Explanation: