The fact that many college graduates get lower pay than some workers has ______ a heated discussion.

He won the first prize in the competition and we were _______ him.

to the Internet, large quantities ofinformation are now _____ to us in our home.

What do you think of the book — I like it very much. It’s interesting exciting.

Our earth is getting warmer and warmer. It is time for us to_____ the emission(排放) of CO2.