It is reported that the United States uses _______ energy as the whole of Europe.[ ]

turned down his invitation to dinner as I didn’t want to ______ on him.

Some of my friends are interested in science, but none of them can tell ________.

Did you enjoy yourself at the party—______!I’ve never been to a more exciting one before.

an to open to the outside world in the ate1970s , there have beengreat changes in the country