Be responsible for your own actions, tell the truth. No matter how difficult it might seem you need to be responsible by not lying.
Be responsible for your body and brush your teeth at least twice a day, eat healthy foods, and exercise.
Be responsible for your grades. Do your best and be proud of it.
Be responsible for your pets. If you wanted a puppy and your parents got that for you, take care of it. Make sure that you clean up after your pet and that your pet is always provided for.
