More and more people have a low-C life and the air is getting much    than a few years ago.

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

The man in the blue shirt is         than the man in the white shirt.

—Do you know Wugong Mountain is the first       one in our province.—Yes, it’s famous for its grassland on the top.

-What do you think of the traffic in our city?-lt's    than it used to be, but there's still a long way to go.