31._____for a strong and fair climate agreement at the key UN summit in Copenhagen, 50,000 people in London wore blue and went to the streets.
Common sense requires us to get away from the concept that national boundaries are frontiers _________ knowledge may not spread.
—Could you say something about Turkey’s downing of the Russian fighter jet? —Sorry. It ______ by a group of experts and will be made clear the moment they get the answer.
Just as Tu Youyou once commented, “In order to make some achievements and ______ yourself in your field, there are certain things you must do.”
With the word PM 2.5 ________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.
Finally, developing teenagers’ critical thinking should be a(n) ______ for education committed to helping students become competent citizens.