laborious

"The children played in the driveway before school. "

"The teacher is requiring students to submit their essays by Friday. "

"The school's computer network is a complex of interconnected systems, linking classrooms, libraries, and administration offices. "

"Gardening in the hot sun is a toilsome task. "

"After the blizzard, we shoveled the driveway for the next two days."

"The painstaking attention to detail in her report earned her a top grade. "

"I was very industrious in my effort to learn unicycle riding."

"The student is solving a math problem. "

"He mentally reviewed the math problems before answering them aloud. "

"How long has it been since your last physical?"

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

"He completed the assignment on time."