______ you are, _____ mistakes you’ll make.

You should practice more to improve your English, then you ’11 be _________ at it.

Let's buy the blue car. It's       than the yellow one and it's more beautiful.

---Which sweater is     ,the red one or the white one ?  ---The red one.

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