27. People have become aware ______the fact that carbon dioxide, poison to the environment, contributes_____ air pollution.
--Hello, this is 77553861.--------___________
--Hello, this is 77553861.
It suddenly to the detective that the millionaire was probably murdered by his own daughter.
—Will Thursday or Friday you ?—Either will .
—Does he know how to work out the problem ?—Yes , he has a good idea to solve it .