open your book | close your book
close your book
stand up | sit down
stand up
stand up | sit down
sit down
open your book | close your book
close your book
stand up | sit down
sit down
stand up | sit down
stand up
open your book | close your book
open your book
stand up | sit down
stand up
open your book | close your book
open your book
open your book | close your book
close your book
open your book | close your book
open your book
stand up | sit down
sit down