It is not known yet how these huge stones were __________over a distance of 380 kilometers.
One third of the country ________ covered with trees and the majority of the citizens________black people.( 2011·湖南)
She showed the visitors around the museum, the construction ________had taken more than three years.(2011·江西)
If better use is ________ of your spare time, you'll make good progress in doing your business.
The couple ________ a health centre in Cambodia,________ their seven year old son was born.
There used to be a mountain in our village, at the top of which ________.