The shorts are _________ of all, but they are _________．

—Of all your coats, why do you like this one best?—Because it’s _________ than the others.

The light railways and subways make it ________ for people to travel around Chongqing. 

We have some bread, but we have ________ milk. Let’s buy some milk.

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