Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to cross your eyes [title] Focus both your eyes on the tip of your nose. [step] Slowly lower your gaze until both of your eyes are focused on the tip of your nose. This may cause a bit of an eye strain, since you're probably not used to using your eye muscles this way.

Ending1: You'll feel the strain come back the more you lower your focus, but you won't be disappointed with the results. [substeps] To test the intensity of concentration, close your eyes for a moment, and see how your eyes feel. Ending2: Though you won't be able to see it yourself, your eyes should now be crossed. But this is no fun so far--since you're looking down, no one else can see that your eyes are crossed. Ending3: Keep focused with the tip of your nose, as it should be aligned with your top eye at all times. [substeps] Your pupil--the part that is most open--should be aligned with your bottom lid. Ending4: Hold the tension in your eyes so that they don't get strained and are more relaxed. [substeps] Make sure you're doing it subtly, because you'll know.

Answer format: ending1/ending2/ending3/ending4