Please choose the correct ending to complete the given sentence: Brushing teeth: A little boy walk toward the sink. The boy stands on front the sink and puts toothpaste on the brush, and then brush the teeth. then

Ending1: , the boy washes the toothpaste sweep over the sink with square toothbrush, after rinse with water. Ending2: other hallows toothpaste on the brush, but it sticks. Ending3: , the boy rinse his mouth and then show teeth and dry mouth. Ending4: , the boy flow the toothpaste into the toothbrush shortly after.

Answer format: ending1/ending2/ending3/ending4