concepts: laugh paper piece rip sit
target: The student laughed when the piece of paper ripped when sitting down.
references: The student laughed when the piece of paper ripped when sitting down. My friends who sit near me, rip a piece of paper from my book and laughs hard badly The teacher laughed as he ripped a piece of paper while the students sat. A baby is sitting in a chair and laughs when a woman rips a piece of paper.