The post office is across ____ the police office.[ ]

Teenagers _______ allowed to drive a car. — That’s true. It’s too dangerous for them to drive a car.

Air is to us _____ water is to fish.

Dinner is ready．Help yourself!—Wow! Thisdelicious．Could you please tell me how to cook it?

The socks are cheap（便宜的）， I’ll________ it.