Once you understand your parent’s concerns, you can come up with ways to address them. Listen carefully to what your parents say. Don’t interrupt, and ask lots of follow-up questions.  You might ask, “I know that you don’t want me to get a cat. Can you please explain why?” If they say that you won’t clean up after the cat, ask, “Why do you think that?” This is especially important if your parents think you won’t have time to take care of a cat. Write down all your commitments for every day of the week. Think about school, homework, extracurricular activities, and chores. Then, figure out how you can fit in cat care. Show your completed schedule to your parents.  Cats require about an hour of play and attention each day.  You’ll need to scoop the litter box daily and change it every week or so.  You should feed your cat twice a day, make sure they always have fresh water, and clean their water bowl daily. A cat can be expensive. Besides the cost of the cat itself, someone will need to pay for trips to the vet, food, toys, and medicine. Know the numbers so you can start saving money and present the facts to your parents.  Getting a cat from a shelter is the cheapest option. You’ll probably pay $50-$100.  Between medical expenses, food, and supplies, it can cost around $705 per year to own a cat. Start saving your money as soon as possible. Spend less of your allowance, get a job, or ask your parents if you can earn money doing extra chores around the house. Your parents may be able to help you out with the expenses. However, you should contribute as much as you can to the cost of the cat. Do some research about the benefits of owning a cat. List all the reasons why you think a cat would be a good addition to the family. Spend some time thinking of ways to address your parent's concerns. You can deliver this information during a conversation with your parents, or make a powerpoint presentation or a written report.  For example, if your parents are afraid that they’ll be stuck doing all the cat care, you can...

TL;DR in Chinese:
问问父母为什么不想养猫。 制定每周养猫计划。 研究买猫和养猫的成本。 攒钱来支付买猫和养猫的相关费用。 向父母讲述养猫的好处。 提前练习你的演示或演讲。 如果家里有人过敏，那么你要为他们考虑，买一只低致敏猫咪。