proficient

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

"The school's computer network is a complex of interconnected systems, linking classrooms, libraries, and administration offices. "

"The relation between diet and health is complex."

"The teacher explained the new math concept quickly. "

"We need to bring the balance of power into equation"

"My sister is very helpful, especially when it comes to organizing things. "

"My dad is an expert at fixing leaky faucets. "

"The baker was skilled at decorating cakes, making each one a beautiful work of art. "

"Our bank offers borrowers an annual interest of 5%."

"Because she had been a dancer for years, she was a practiced performer. "

"In Newton's analysis of motion, the fluent represented the constantly changing position of the ball, its value always dependent on time. "

"Has your girlfriend written you another letter already? She’s quite a writer!"