---The students sitting at the back can’t see the blackboard________. ---Why not_________ them move a little forward?
South Africa (南非) is a country.
Columbus __________ America in 1492.
-Have you visited New York?-Yes, I have. I __________ there twice.
Our English teacher __________ to England. She'll come back in ten months.A. have beenB. has beenC have goneD. has gone
The music made me think of the __________ of a running stream.