Our desks and chairs (make) of wood. The paper of books and newspapers (make) from wood, too. Wood is important in our daily life.
Where does wood come from? It (take) from trees which grow in the mountains. Do you know how it (carry) to us from the mountains?
First of all, trees (cut) down when they (grow) big enough. Then their branches (cut) off, and logs(原木) (make). These heavy logs (put) together in different ways and (take) down to the foot of the mountains.
