Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to train your rat to do tricks [title] Rat-proof any rooms. [step] When you train your rat, you will do this outside of the cage. Make sure the room is rat-proof so you keep your rat safe.

Ending1: However, you should also note that you should have at least two escape routes out of the room and down the stairs. [substeps] A rat that is stuck in an upstairs room won't be able to jump far into a basement. Ending2: You don't want your rat running off or getting hurt! Close up any exits, remove other animals, and move electrical cords and wires that it could chew on. You should also get rid of any chemicals or substances they could eat. Ending3: Check multiple rooms in the room and make sure your rat is not there for hours at a time, even if it's just in the room. [substeps] Many rats love to hide in a hiding place and you should leave some areas you have rat rat-proofed so you can train your rat. Ending4: Rats usually use fumes to escape and they are more likely to do tricks in smaller spaces. Close any windows or cut off ventilation from room vents.

Answer format: ending1/ending2/ending3/ending4