collaborator

"My classmate Sarah and I are working on a science project together. "

"My brother flunked biology because he cheated on his mid-term."

"The school's fundraising project aims to renovate the library in several stages. "

"He handed them the letter.   She handed responsibility over to her deputy."

"She moved toward the door."

"The students cooperates on group projects to get better grades. "

"Her answer to his proposal was a slap in the face."

"My younger sister achieved good grades in her math class this semester. "

"He is a student of life."

"The teacher's lesson plan was together, covering all the key concepts logically. "

"Of course in my opinion Social Studies is more of a science than an art."

"My classmates and I are working on a group project for science. "