The harder you study, __________grades you’ll get.

—Sonia, do you think you are different from Linda?—Yes. I'm ______ at drawing than her.

To make our city greener and cleaner, we need ______ trees.

— The number of pandas is getting________ because their living areas are becoming polluted. — So we must do something to protect them.

John doesn’t play the piano _________________ his classmates in his class.