I think there will be _____ people and ______pollution.      

If you want to be thinner and healthier, you should eat___food and take____exercise.

----How is your new math teacher ? -----We couldn’t find a _____ one . All the students love her very much .

--- Why did you buy two pairs of shoes? --- It was so hard to choose which was________, so I took them both.

Now the air in our city is _______ than it used to be．Something must be done to stop it．