The Mekong River Commission has found no evidence the dams on the upper reaches have an influence on the water flow downstream.
It was in the factory _________ produced TV sets _________ I got to know her.
Factory workers have to work very hard, and _________.
Only when David did it a second time _________.
So instructive _________ that the student wanted to see it again. A. was the film B. it was the film C, the film was D. the film it was
Not until I went to America _________ what kind of country it was.