During the 1960s, songs about winter ___________ by many famous rock groups were popular among people of different ages.
If we had taken such effective measures much earlier, the river ________ so seriously now.
More and more attention has been drawn to the fact that many children are ________ in the countryside when their parents flood into the cities for jobs.
--How did you find your visit to Qingdao, Joanna? --________.
Mr. Black ________ for Shanghai in a few days. Do you know when the earliest plane ________ on Sunday?
To pay to see that movie seems foolish ________ you can see it on television for free.