—What did our geography teacher say? —She told us that the earth ___________ around the sun. A. moves B. moved C. has moved
Xi’an is a city with many places of interest and ____ tourists come here every year.
—_____ you _____ your homework yet? —Yes, I _____ it ten minutes ago.
It’s necessary for you _____ exercise every day.
—Could you tell me ____? —Sorry, I don’t know.
The Greens _____ China for seven years.