Select the most appropriate option to fill in blank no. 5.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. find.
"Find out" means to discover or learn information about something. It is commonly used when you want to suggest that the reader will come to know more details or information.
The sentence is directing the reader to learn more about the other kids by reading the book, so "find out" fits perfectly.