strenuously

"The student scribbled notes in the margin of her textbook to help her remember the key concepts. "

"I spent an hour at lunch."

"She gave a studied reply."

"It looks weaker and weaker, the more I think about it."

"Before I tackle the question directly, I must briefly review historical approaches to the problem."

"He is a student of life."

""Many students have problems understanding fractions." "

"Her diligent practicing on the piano led to a stunning performance at the recital. "

"My sister learned to write in a very careful manner. "

"The government's spending on education increased this year. "

"The exam of the child's handwriting revealed several areas needing improvement. "

"The marathon training was very strenuous, requiring a lot of energy and effort. "