1. communication solution: try to communicate with your roommate to find out if there are any abnormal behaviors or sounds, or if there are suspicious people. If there are disputes or contradictions, they should be eased as much as possible to avoid causing more dissatisfaction and conflicts.
2. Looking for clues: Try to collect clues, such as observing whether there are strangers in the dormitory area, paying attention to whether there are items lost, checking whether there are strange traces, and so on. If you have suspicious clues, you can contact the boarding house or school.
3. Take care of valuables: Make sure your valuables are properly kept, preferably locked in a cupboard or put in a safe place.
4. Record evidence: If you find something missing, you can take photos or video to record evidence for follow-up investigation.
5. Alarm handling: If serious situations are found, such as high value of stolen goods or obvious criminal acts, you can consider calling the police.