Bob can play ________ tennis but can’t play ________ violin. 

—After I graduate, I'll try to get a job, you know, as        engineer. —You’re practical. I’m sure you can do a good job.

I lost________ key to the door yesterday.  It was________ unlucky day for me.

—What’s the matter, Tony? —I have ______fever.

I had ______ interesting experience on Sunday.