Answer:
4.(D) The train stopping at the drawbridge is almost like an unwanted interruption in the lives of the rich and famous who live in the lap of luxury and have enough money to travel in the fastest and most expensive transportation at the time.
The stop in the Valley of Ashes is described almost sarcastically as if the passengers in the train would have desired to take in the bleak and somber landscape of the dark and filthy valley laden with ash and industry.
5.(C) Because it explains how the lemons and oranges that are delivered to his back door are all used up within a fortnight because he is always throwing parties and events. It also explains that tons of caterers come down with canvas to decorate his enormous garden. Almost giving the reader a first eye glimpe of just how all out and extravagant Gatsby really is.
6.(A) Because " I had taken two finger-bowls of champagne, and the scene had changed before my eyes into something significant " meaning he only took a glimpse and before he knew it the whole atmosphere of the party had changed before him.
Explanation: D-C-A