Final answer:
The police are checking rooms, computers, passengers, and hotel registration books.
Step-by-step explanation:
The police are checking various things in this scenario. Firstly, they are checking the rooms to ensure there are no illegal activities or suspicious items present. Secondly, they are checking the computers to potentially gather evidence or investigate any digital crimes. Thirdly, they are checking the passengers to ensure safety and security, especially in the context of transportation modes. Finally, they are checking the hotel registration books to keep a record of guests and potentially identify any suspects.
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