It was lucky that Mimi started sneezing at the exact time she did, because I didn't want to have to say, "I can't tell you what my project is because it is a three Grace secret." Plus I didn't want to tell her why I was going to have to go to the grocery store after school and ask for nineteen empty boxes.
Nineteen boxes = one for everyone in the class, even Mr. Frank and Miss Lois.