Answer: Allusion
Explanation: An allusion is a literary device used to reference another object outside of the work of literature. The object can be a real or fictional person, event, quote, or other work of artistic expression.
"An" is one of two indefinite articles.
If you mean which sentance best represents the moral of the story then it would be the second to last sentence: "At last a Wolf really did come, and the Boy cried, "Wolf! wolf!" as loud as he could: but the people were so used to hearing him call that they took no notice of his cries for help."
The woodpecker gave Hiawatha the secret to defeating his enemy.
Rhetoric is a strong part of english. Especially connotations of words - often at home, my mother hates the word;
When applied in the correct context, okay can mean whatever you say. It isn't a strong word for acknowledgement or conviction the way the word 'yes' is.