The employee proved ___________ to the job and the boss praised him.

We need to spend more time researching these suggestions so that we can make a(n) _______ choice.

 Mr. Smith,       with the       result of the experiment, sat on the chair, smiling.

This book is well worth _______. Would you like to buy one?

----Thank god, you finally returned home _____.----You can never imagine how I worried about you when I was told about the terrible accident.