Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to make a liquid into a solid [title] Place a small open container of water in the freezer compartment of a class or home refrigerator. [title] Leave the water there for several hours or overnight. [title] Remove from the freezer and note what has occurred.

Ending1: [step] Water changes state from liquid to solid when it reaches a temperature of 0 degrees celsius, or 32 degrees fahrenheit. This is a simple example of changing from liquid to solid, or freezing. Ending2: [substeps] Check that the container is completely dry, but no ice has formed. You should get a sample before disposing of it. Ending3: [step] Don't drink and continue making liquid. [title] Separate the ice water if you're not used to using water. Ending4: [title] Set a timer to check on the reaction. [step] The liquid should be safe to use again once the water has frozen completely and the food appears firm.

Answer format: ending1/ending2/ending3/ending4