Around 15,000 officials gathered in Copenhagen, trying to map out an effective strategy _____ the battle against climate change.
while intelligent people can often ____ the complex ,a fool is more likely to complicate the simple .
They _____ on the program for almost one week before I joined them and now we ____ on it as no good results have come out so far.
____ how others react to the book you have just read creates an added pleasure.
The driver was at ____ loss when ______ word came that he was forbidden to drive for speeding.
The students got out of the classroom_______ the class is over.