Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to breed mice [title] Give your mice a comfortable home. [step] A mouse cage with a plastic base and wire lid makes a great mouse home. You can easily find these at your local pet store.

Ending1: They're also stackable, which is great if you want several mice to mate. [substeps] Other types of containers, like rectangular aquariums and plastic storage bins, can be used. Ending2: [substeps] Make sure the opening of the cage is wide enough for your mouse to fit through. This ensures that the mouse can get things to chew and drink from it. Ending3: You'll need to buy more than one cage, so make sure to order at least three. Put the cages in the freezer and remove them one at a time. Ending4: You can also purchase your own wire cages or build them yourself. [substeps] Do not use any plastic or glass cages.

Answer format: ending1/ending2/ending3/ending4