George heard the sound of a key being put into the study door.

Nothing of the key to what was going on had been given her.

The other half of the key had been his own heart.

He knew they must be near the state park at the end of the key.

About this time I found out the use of a key.

All this information is available at the press of a key.

There was the sound of a key in the door.

Is that part of the private key in some way?

He must have opened it with a special type of key.

A moment later came the sound of a turning key.