Maybe you should ask some real English questions .-.
Answer:
I am also confusion.
Explanation:
You didn't give us the story to read. Otherwise, I could've helped you.
Answer:a The "boarder" is introduced in Chapter 5. His full name is Ewing Klipspringer. He appears to be a former party guest who just made himself at home in Gatsby's big mansion, where it is very easy to lose a guest.
Explanation:
I'm going to say "It set up the events necessary for the surprising conclusion." :)
Do you have to explain these or do you have to write a story