Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to make an egg dropper experiment [title] Take one piece of paper. [step] Roll the paper into a long tube tightly around the egg. Tape the tube along the edge tightly so the egg has little wiggle room.

Ending1: Add whipped topping or mayonnaise for extra flavor. [title] Cut the tube into several pieces and place these together. Ending2: [title] Use tape at the tip of the tube to mark a circle at the top of the roll of paper. [step] Give the tube a gentle push to mark the circle. Ending3: [title] Position the egg as close to the center of the tube as possible. [step] Use the pencil to puncture one hole below the egg straight through both sides of the tube. Ending4: You may need to cut off some extra so that the tube continues to spread out and drip, leaving behind a mucus-free substance. [substeps] You may need to alternate paper tubes to let the egg circulate more freely.

Answer format: ending1/ending2/ending3/ending4