By the middle of the 21st century, the vast majority of the world's population __________ in cities rather than in the country.
In such hot weather the crops will have to be watered if they .
The top officer in Beijing says that all construction work for the Beijing Olympic by 2006.
The reason she can finish the homework ahead of time is she is both clever and hard-working.
When to a certain temperature,water can be turned into steam.
We don’t of her going to work in the fields in the sun.