What the boy said sounds ______.

Traveling around big cities by taxi can cost a lot of money, but it's usually        to take the underground train to most places.

—Look, Victor. This brown cat is ________ than that white one.—Yes. And it is _____ of all these cats.

The meat is ___ expensive and eating ___ meat is bad for your health.

To live a low-carbon life , we must try to save _____ energy and produce ____ carbon .