Material 2: A university professor plagiarized students' academic papers.
Material 3: Nanjing subway villain scolded the girl for three hours.
Material 4: Many people have no habit of flushing after going to the toilet in public places.
Material 5: Lu Yu's old man fell to the ground, and no one dared to come forward to help him without a witness.
Material 6: Civilized law enforcement has been called for so many years, and urban management is still the devil in the hearts of ordinary vendors.
Material 7: In recent years, many senior officials of the prefix of the country have fallen. How did they reach the top?