Computers can do nothing．But once ______what to do, they show extraordinary power to do a great deal．

________the working efficiency, the boss allows the employees to have a coffee break. 

Has the boy who was made use of ________ realized his mistakes?

-- Have you considered _____ your job as a teacher?　 --- Yes. I like the job because a teacher is often considered _____ a gardener.　 

There is nothing more I can try          you to stay, so I wish you good luck.