knocks

"They looked at the landscape in admiration."

"He discovered penicillin largely accidentally."

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

"After using the wrong type of fuel, the mechanic suspected preignition was damaging the car's engine. "

"The student's leadership in the class project helped the team succeed. "

"His admittance to the university was a cause for celebration. "

"The undervalue of her antique vase meant the seller received far less money than it was truly worth. "

"The characteristic smell of freshly baked bread always reminds me of my grandmother's kitchen. "

"The inexperienced intern made a few mistakes, but he was eager to learn. "

"The combustion of wood in the fireplace kept the room warm. "

"Our company associated with a local charity to help raise money for their programs. "

"the performance of an undertaking or a duty"