—Bob, your room is so dirty. It must ________ every day.
—OK. Mom, I’ll do it right now.
clean
be cleaned
is cleaned
It’s important ________ the piano well.
He’s really _________ after the _________ tennis match.
New York is famous _________ its tall buildings.
—How much does it take to build the school library? — Four________ yuan.
The population of Henan is ________ than that of Shandong.