School cleaning day Today is Saturday. It is our cleaning day. The pupils of our class are cleaning our classroom. Mary is cleaning the door. She is standing on a chair. Tom and some others are cleaning the windows. Some of us are sweeping the floor. Others are cleaning the desks and chairs. I am taking down the old pictures and putting up some new ones. Our teacher is in the classroom,too. She is helping us to put the desks and chairs in order. Mary is    _
cleaning the door cleaning the windows sweeping the floor cleaning the desks and chairs