All of us are_____aware of the cause of this failure, so do not make the same mistake again.

He sold his farm, _________ gaining enough money for his journey. 

The U.S. official said North Korea --- and Iran --- should follow in the steps of Libya, which last December said it would work__________ to allow international weapons inspectors to do their work. 

 —Have you finished your experiment report, Jane?—Oh, my God. I’ve _____ forgotten all about that.

Most of my friends use their cars ________for their job.