Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to open a cat's mouth [title] Pick a time when your cat is at ease. [step] Don't try to open your cat's mouth when it is riled up, playful, or upset. You should also avoid waking your cat up to open its mouth, as it could scare the cat.

Ending1: Plus, don't comfort your cat when it is still upset and has trouble opening its mouth. Avoid spending all day trying to talk to it or playing with it. Ending2: Instead, just pick a time when the cat is calm and happy and wants to be around you. [title] Plan how you will position yourself and the cat. Ending3: If your cat is distracted, you can use this time to notice its natural behaviors. [substeps] Wait until the kittens are between six and eight weeks old. Ending4: [title] Refrain from inhaling or stifling the cat's breathing. [step] Avoid inhaling or stifling the cat by breathing over it.

Answer format: ending1/ending2/ending3/ending4