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

I take exercise every day and I’m _____   __ than before.

 –You should be _______ careful when you take the chemistry exam.--I agree. In this way, I will make _______ mistakes.

The population of China is ________ than ________.

—How did you lose the soccer match?—We had _______ players. They had eleven while we had only nine!