Nowadays, many people walk to work ________ Copenhagen Conference calling for living a low-carbon lifestyle to cope with global warming.
I don't know the reason _________ you were absent from the meeting, but I'm sure it's for some reason _________ you don't want people to know.
—_________ on historical facts, it's well worth reading.
This oil painting represents the highest level of the painter and deserves _________ a matchless piece.
The streets are named _________ the world champions who broughtreputation to the district.
The purpose of our advertising is to _________ customers’ attention to our products.