Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to do skin icing [title] Make ice cubes. [step] Clean an ice cube tray and fill it with water. Place it on a flat spot in the freezer.

Ending1: Place a piece of frosting onto one of the ice cubes. Wipe your skin with a towel to cool it while you wait for it to come to room temperature. Ending2: Put it in the freezer overnight or until solid. [substeps] Dilute rosewater or fresh lemon juice in ice cube trays for extra benefits. Ending3: Keep an eye on it for several hours. When it freezes solid, it will be cold enough to do a skin icing for you. Ending4: Place one small bowl with the ice cubes in it next to the tray. Put water into the larger bowl and place the ice cubes in the smaller bowl.

Answer format: ending1/ending2/ending3/ending4