vigilant, wide awake, aware, watchful, attentive, observant, circumspect, wary, chary, heedful, canny
The answer is C, hope this helped.
10.) An angel
11.) He accepts an insincere dinner invitation
12.) An education in the ways of new money
13.) Dan Cody gives Gatsby experiences that makes him want to presue a life of wealth
14.) Old money means money passed down through family, new money means money earned
15.) 3 years
16.) False
Credit to CassidyHarper
