keystones

"communication of a secret"

"The company's profitability improved significantly after implementing new marketing strategies. "

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The combination of soft music and warm lighting created a relaxing atmosphere in the living room. "

"The student's excellent performance on the math test showed they had surpassed their previous scores. "

"The birds had built an amazing structure out of sticks and various discarded items."

"Many retailers offer discounts during the holiday season. "

"My son consistently gets good grades in math class. "

"The teacher's lesson plan was together, covering all the key concepts logically. "

"The school's fundraising projects aim to build a new library. "

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

"The shortstop ranged deep into the hole to make the stop."