I believe that the answer could be absolutely anything, if so then “extreme” and words similar to it could fit there.
“A flash of extreme joy appeared upon the woman’s face.”
I believe the answer is <span> To give background historical information regarding the book
Giving the background of the historial information will make the readers understand the entry point of the book, which tell a story about the hardship that is faced by Aho which was born at the last moment of Great times in Kiowa's history.</span>
