Nowadays, many people walk to work _________ the Copenhagen Conference calling for living a low-carbon lifestyle to cope with global warming.
Never should we forget the war and sufferings _________ caused to the people.
This software______ protect computers from being attacked by viruses and it took my brother a long time to ______ how to start it.
— Oh, you sounded just like a native. — ______. I still have trouble expressing myself.
The scientific awards, like the Nobel Prize in 2015, are equal to all, ______ the research findings are good enough.
Schools should be lively places where individuals are encouraged to ______ to their greatest potential.