Please choose the correct ending to complete the given sentence: Brushing teeth: A boy wearing glasses is sitting down. Someone is brushing his teeth with a toothbrush. they

Ending1: hold up the toothbrush and a knife. Ending2: put toothpaste on a stick. Ending3: take the toothbrush out of his mouth. Ending4: put toothpaste on an electric toothbrush, and demonstrate how to use the toothbrush.

Answer format: ending1/ending2/ending3/ending4