The doctor came out and said the operation was well finished. The parents smiled ________ and the nervousness disappeared from their faces.

What’s this — ____ is a key.

The silence of the library ___ only by the sound of pages being turned over

I have________ read Robinson Crusoe , but I haven’t read Tom Sawyer ______.

The two people speak different languages and can not communicate with each other well.—Oh，I see. That’s ________ misunderstanding occurs.