As we know, paper is made ________ wood , that is to say wood is made ______ paper.
I spent half an hour ________ the piano every day.
I _______ to learn to play the piano ever since then.
----Why not _______ to the park now?---- Good idea! Let’s go.
They were made ________ the classroom after class.
My teacher told me that the moon _______ around the earth.