Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to exercise a hamster [title] Provide the cage with a hamster wheel or " tread-wheel ". [step] This is a wheel that turns about when the hamster steps inside and causes the hamster to run as he continues to turn it around. When choosing a hamster wheel or tread-wheel, the following is recommended : [substeps] Ensure that the wheel is solid.

Ending1: There should be no rocks or other potential places that the hamster could get stuck inside. Comfortable wheels are essential to good sized hamsters and are recommended by breeders. Ending2: If your hamster chews a great deal a solid metal wheel is best. Never use a mesh or barred wheel-these can cause serious injury because the feet can get stuck between the slats or bars. Ending3: This can be done in a cage at any age or at any height. This will help your hamster run around a bit more and escape from his wheel/tread-wheel. Ending4: The wheel should pivot easily so that the hamster can start to turn it, not as if it is not moving. Make sure that it is sturdy enough to move from one side of the cage to the other.

Answer format: ending1/ending2/ending3/ending4