---Ann, I’m worried I’m getting fatter. What shall I do?---I think you should eat          food and do more exercise.

 Of all the students, Li Lei is _______to Mr Wang.

The boy isn’t short .He is ________than he was two years ago.

If everyone pours less polluted water into Dianchi Lake, it will be _______.

------Which do you prefer to live in, the city or the countryside? ------Of course in the countryside. The air is much _________.