Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to sharpen skates [title] Wear proper protection. [step] At bare minimum, you should wear shatter proof glasses or goggles when machine-sharpening skates. Ear and breathing protection are also recommended.

Ending1: Try wearing noise-canceling goggles, which can help when using a machine. Keep a close eye on the skates while the blades are being sharpened. Ending2: Do not wear loose clothing or accessories that can be caught in the grinding wheel. Tie back long hair and consider a protective hair covering. Ending3: If you move around a lot in the winter, your hearing will be compromised. [title] Consider different customizable skates. Ending4: When sharpening, wear noise-proof socks or protective footwear. If you are sharpening on flat surfaces, wear thick socks and wear goggles as well.

Answer format: ending1/ending2/ending3/ending4