normally

"He is a student of life."

"The child's growth was abnormally fast for his age. "

"The amount of time it takes to finish my homework is a variable; sometimes it takes me an hour, other times it takes much longer. "

"The school's student handbook is our customary guide for behavior during lunch break. "

"The program will run smoothly under these conditions: the computer has enough memory and the internet connection is stable. "

"Except for one or two days a year, he usually walks to work."

"The distribution of the school supplies was done fairly, giving each student an equal amount. "

""Because of unforeseen circumstances, the school trip was cancelled." "

"The professor explained the Gaussian elimination method, a mathematical technique developed by Gauss, for solving systems of linear equations. "

"He was greatly agitated by the news."

"He never expected to be discovered."

"The children clustered around the puppy."