Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to make dwarf hamsters stop biting the cage [title] Let your hamster play more. [step] Let him roam around on you, on your bed, or in a hamster-proof area. Exercise may help work out the boredom that your hamster might be feeling.

Ending1: [title] Stay away from hamsters that strike out when they get bored. [step] Due to the mixed-breed hamster species, dwarf hamsters tend to lash out when they don't want to be fed. Ending2: [substeps] Pick a time and place for his exercise. It could be a backyard, a park, or a game trail. Ending3: [substeps] An exercise ball is an excellent way for your hamster to get exercise every day, while also protecting him from potential household hazards. Just be sure to supervise your hamster while he's in his ball. Ending4: Running and running around the room while playing will help his teeth stimulate their natural urge to bite. You can even take your hamster outside to play when his need to chew is riding him too much.

Answer format: ending1/ending2/ending3/ending4