My sister is _____more outgoing than me.

We hope that with the help of the new skill, Liu Xiang can run ________than before.

—Which season do you like _________，winter or summer?—Summer.

At present, the students in China take more exercise. Most of them are ______ than before. 

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