You have to believe in yourself. Self-confidence is _____ to success.

.The little boy was found_________in his room the next day.

From the ___ expression on her face, we knew that the problem was ____.

My car’s performance is ___ since the engine’s been tuned and the tires have been changed．

The old farmer’s eyes still shone bright in the wrinkled brown face and his step as he came across the room was ________, though slow.