Please choose the correct ending to complete the given sentence: Welding: A man is working over the back of a trailer. He is welding the metal between two pieces of wood. sparks

Ending1: fly as he screws more together. Ending2: fly as the metal peels off. Ending3: fly as he works, crouching down on the sidewalk. Ending4: fly as he pieces of wood are thrown off of the top.

Answer format: ending1/ending2/ending3/ending4