persisting

"It is very important to give your daughter independence in her life so she learns from experience."

"I need to study my biology notes."

"The child's first utterance was "Mama." "

"I was planning on archiving the documents from 2001."

"The student resolutely finished the difficult math problem. "

"My sister got a permanent for her wedding, which was supposed to last for several months. "

"He stubbornly refused to quit trying, even after failing 20 times."

"It frustrates me to do all this work and then lose it all."

"The complicated instructions on the new software difficult me from completing the project on time. "

"We challenged the boys next door to a game of football."

"Even though it was difficult, she persisted in her studies until she graduated. "

"Her persistence in studying every day helped her pass the difficult exam. "