Answer 3. Writing as you speak can sound informal
I believe that the most fitting answer for this question would be the word "giggle." Even if you have never read this story before, you can assume from the girls' laughter that what is about to happen is going to be amusing and fun. This word is the best hint that something amusing is going to happen. I hope this helps.
#2: your sense of self or identity is made up of your beliefs, attitudes, abilities, history, ways of behaving, personality, temperament, knowledge ,opinions, and roles.