Many nations have promised to reduce greenhouse gas emissions, but are falling short of the _______ reduction of 25 to 40 percent of 1990 levels.
There is some doubt_______ he can win the first prize.
It is _____ that the Chinese ping-pong team will win the prize.
Could you tell me__________________?
In my opinion, the film is ______worth _______a second time.
The class will _______on some important matters.