In the first book Montag read "we cannot tell the precise moment friendship is formed" Montag recalls his feeling when he was with Clarisse. The second book "That favorite subject, myself" Clarisses' favorite subject was not herself.
Answer:
a plot that is grounded firmly in reality
18)My sister who lives in San Francisco<u><em>, </em></u> is a chemist!
19)My sister who is a doctor , lives in London!