Please choose the correct ending to complete the given sentence: Skiing: A child ski on the snow holding two poles and wearing skies. adults

Ending1: sleds on snowboards on a flat snow hill slope way. Ending2: push the snow, which go down hill in the ski lift. Ending3: but children ski from a ski slope. Ending4: ski behind the child.

Answer format: ending1/ending2/ending3/ending4