confidence

"The student's ability to concentrate in noisy environments was crucial for success in the class. "

"My discussion with the professor was very enlightening."

"He will need lots of practice with the lines before he performs them."

"My presumption that everyone would be at the meeting was wrong; several people were absent. "

"The president of the student council used last year's debate as a precedent for this year's election rules. "

"My mother's assurance that I could succeed in the test boosted my confidence. "

"My certainty about my ability to finish the project before the deadline was high. "

"The student showed boldness when she spoke up in class, even though she was nervous. "

"It was presumptuous of him to assume he'd get the promotion just because he'd worked there the longest. "

"a successful use of medicine;  a successful experiment;  a successful enterprise"

"My brother will participate in the school's fundraising walk. "

"The information about the project deadline resolved my uncertainty; now I know what needs to be completed. "