Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to put contact lenses in your child's eyes [title] Wash your hands with soap and warm water and dry them thoroughly. [step] If you are using a towel, make sure that you do not have any fibers from the towel on the index finger you are using to insert the contact lens. [substeps] Avoid drying your hands with paper towels, as these tend to leave more fibers on your finger.

Ending1: [title] Place the contact lens in a tube. [step] The tube should be fairly flexible, meaning that if you roll the contacts around too much and them bend too much they will slide out. Ending2: Unlike regular towels, which hold oils, the paper towel may cause the lenses to burn or deplane. If you make a mistake, do not continue the process. Ending3: These fibers make the lens slippery and can easily be damaged. Use a soft disposable toothpick. Ending4: [title] Position your child so she is facing you. [step] With her head tilted slightly back, ask her to look forward and then slightly upward.

Answer format: ending1/ending2/ending3/ending4