hat I had previouslythought, my new deskmate turned out to be a very interesting guy

_____ computers are convenient to us in daily life, it may also cause other problems

well-known to us all that knowledgeis __ treasure, but practice is ___ key to it.

I am not good at dancing, you know —- ______ It’s just for fun

I didn’t see her in the meeting room this morning. She ________ at the meeting.