Please choose the correct ending to complete the given sentence: Fixing bicycle: A man shows how to change a tube in a tire. he

Ending1: puts a jack under the tube to lift it up. Ending2: puts a new tire on the tube. Ending3: takes the old tube out, puts the new one in, then pumps it up. Ending4: moves dirt covering the tube.

Answer format: ending1/ending2/ending3/ending4