stimulants

"He is a student of life."

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

"The athlete's physiological responses to the intense workout were carefully monitored by the coach. "

"The scientist carefully examined the substance to determine its chemical composition. "

"I need to study my biology notes."

"The teacher's passionate presentation interested the students in learning more about the rainforest. "

"The student's enthusiasm for history was a form of divine inspiration, making him memorize facts effortlessly. "

"The box contains my old toys. "

"Pit row was abuzz with activity."

"The increase in homework assignments this week was significant. "

"Many students drink coffee for the caffeine to help them stay awake and study. "

"He promoted his clerk to office manager."