[填空题]Children play snow happily on the ground.
There are children ______ snow happily on the ground.

[填空题]Children play snow happily on the ground.
There are children ______ snow happily on the ground.

[填空题]Children play snow happily on the ground. There are children ______ snow happily on the ground.

[填空题]The children (play)（）the violin over there will go on the stage next week.

[填空题]The children (play) ________ the violin over there will go on the stage next week.

[单项选择]How long did the children play
A. Two hours.
B. One hour and a half.
C. Half an hour.

[简答题]Green Spaces in cities
Where do children play Years ago, any open field, any vacant lot, any group pf trees--these were the places where children played. As families left family farms, small towns, and the countryside, and moved into cities, the places for their children to play in became rarer. Children in the cities had few options, fewer choices of places to play.
In fact, all people’s lives change a lot when they move to the city. (51) In cities, homes are built on top of one another--in enormous apartment buildings. (52) The feeling of private space and ownership no longer exists in houses literally piled one on the other.
Psychologists have been studying the changes people experience when they leave rural area and move into urban environments. On clear findings from their studies is that people need green spaces for better mental health. Children can play on paved playgrounds. That’s true. However, they just don’t have as much fun as children i