Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to build a snow penguin [title] Check the snow condition. [step] It's important to make sure that you have the proper snow for snow sculpture. It needs to be firm but not too icy nor slushy.

Ending1: Make sure that the snow doesn't get wet before layering. The bottom snow layer should also be firmed up for air to flow through it. Ending2: If it's too dry, you will not be able to hang your penguin on the ice. [substeps] Make sure to pay attention to the temperature. Ending3: You can chisel and scrape the snow to make it smooth and easier to work with. [title] Take a bucket and fill it with water. Ending4: Test it by rolling into a small ball and seeing how the ball forms and stays together. If it forms easily and stays in shape, the snow is good to use.

Answer format: ending1/ending2/ending3/ending4