If one of the computers _______, the whole networks would be unable to work.

The news was so ____ that all the people present at the meeting were _______ at it.

I’m amazed that Tom is only 25. I thought he was_______, for he seems to be in his thirties.

The young lady，seveal attempts to fix her cell phone，decided to have another try

Nick, it’s good for you to read some books ______China before you start your trip there.