Books are made________paper and paper is made________wood．

—I’m tired and don’t feel well．
—Oh，you should stop________and have a good rest．

—________is the elephant?
—It is about 3 meters high and it weighs about 2 tons．

—Where is Tom?
—He________playing basketball on the playground．

In the 1960s，a lot of old city walls in Beijing________because people thought them useless．