With five minutes left before class, Laura walked into the classroom. Immediately, she was keenly aware that the atmosphere in the classroom was not right. Everyone was looking at her with a strange face.

When Lucy saw her, she stood up nervously, "Laura, don't get angry. Listen to me first ..."

"What's wrong?" Laura felt strange. Just about to sit down, she inadvertently looked at the trash can. There was a pile of paper inside, which was brand new. Exactly the new books she got yesterday! Her hand clenched.

"Who did this?" She held the corner of the table, her face as cold as if it was covered with a...