Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to keep a dog from chasing the vacuum cleaner [title] Put your dog in its crate. [step] To prevent your dog from chasing the vacuum cleaner, crate your dog. Put it in its crate and close the door.

Ending1: This way, when you vacuum, your dog cannot chase the vacuum cleaner. [substeps] You may feel more comfortable crating your dog while you vacuum if you are used to keeping it in its crate. Ending2: If your dog starts chasing the vacuum cleaner, just close the door and lean it against the crate so it cannot jump out. [substeps] If your dog is attempting to grab the vacuum cleaner from the crate while it is shaking, you could close the door so your dog can't get that toy. Ending3: Close the door so your dog can't run away from the vacuum cleaner. [title] Use closed-circuit safety devices on your vacuum cleaner. Ending4: Ring a bell a few times and say " come here " if your dog is fast enough. Wait for your dog to enter your crate.

Answer format: ending1/ending2/ending3/ending4