Please choose the correct ending to complete the given sentence: Cleaning sink: The four step is to put abrasive powder on a sponge to clean thoroughly the bathroom sink, then the fifth step is to mix vinegar with water. in the sixth step

Ending1: , the person puts the vinegar on a sponge, and then cleans the bathroom sink and the faucet. Ending2: , the host shows how to press powder on brush. Ending3: , the towels are wet and the white towel is soaked in the vinegar. Ending4: , four steps is finished.

Answer format: ending1/ending2/ending3/ending4