The company has just launched an advertising campaign to ____ their newly produced bicycles.
With all his attention ______ on his experiment, he has no time to spend with his family.
One primary goal of UNESCO is to ______ a modern knowledge society in which all people can participate in information and knowledge.
It was obvious that Climate Change Conference in Copenhagen became the ______ of media attention.
The government is trying to ______ pollution to an even lower level so that we can have a better environment.
At times the balance in nature is ______, resulting in a number of possibly unforeseen effects.