Final answer:
Boo Radley is more comfortable in the nature. Just like nature, Boo Radley finds solace and peace in the absence of human interaction.
Step-by-step explanation:
The word that completes the sentence is nature.
Boo Radley is a character from the novel 'To Kill a Mockingbird' by Harper Lee.
He is portrayed as a mysterious and reclusive person who prefers solitude and quietness.
This is evident from his limited speech and his comfort in the natural surroundings of his home.
Just like nature, Boo Radley finds solace and peace in the absence of human interaction.