The air in Beijing is getting much ______ now than a few years ago.

During this term’s Reading Week, I read the most books in our class. No one read      than I.

Yang Shanzhou becomes well-known in China for planting so many trees for people.

There will be  _____ people and  ____ pollution in the future .

—Peter’s father is a _______ math teacher.—I think so. He teaches _______.