---How much should I pay for the food, Sir? --- It costs_______. The food is free on our ship. _______ needs to pay for it.
—Where are you off to for your winter vacation? —I am off to a place________I can relax.
In the 1960s,a lot of old city walls in Beijing________because people thought them useless.
—Where is Tom? —He________playing basketball on the playground.
—________is the elephant? —It is about 3 meters high and it weighs about 2 tons.
—I’m tired and don’t feel well. —Oh,you should stop________and have a good rest.