Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to keep a gerbil safe around other pets [title] Pick a glass tank that keeps your gerbils inside. [step] Gerbils have a tendency to escape if at all possible, which could lead to them coming to harm. For instance, they can squeeze out of a wire cage between wires, and they may chew up plastic to the point that they can escape.

Ending1: Glass cages also develop a tendency to crack, which can lead to their death. Choose a glass water aquarium, or gallon bucket or plastic quart aquarium. Ending2: Make sure the glass tank is deep enough for your gerbils to be inside, but will not allow them to crawl or jump into the tank. This is especially true of a dwarf gerbil. Ending3: If you are particularly concerned that your gerbils should be with other pets, purchase a glass tank made for them. Some other options include : [substeps] A metal tank. Ending4: Instead, pick a glass aquarium with a wire-mesh top so gerbils can't escape. [substeps] The wire needs to be durable so the gerbil can't chew through it.

Answer format: ending1/ending2/ending3/ending4