He_________（交换）his old car for a new model as soon as he won the money.
Harbin is a cold,_________（工业的）centre in the north.It has over three million inhabitants.
Never waste food!You know,children in some African countries die of_________（饥饿）every day.
He_________（同意）with them about the need for change.
In Rome,there are many_________（古代）buildings which attract thousands of tourists.
There are seven_________（大洲）and four oceans in the world.
