My favorite activities are dancing, skiing, and riding my bike
Start off the thesis with describing why it's important for children to have pets, and talk about your purpose without stating it specifically. If this is from a prompt make sure you answer the question in your thesis. Tell the reader what you will be talking about before explaining your contents.
The answer is: in sequential order from the earliest events to the later events.
Answer:
#1: It's Something You're Interested In
A paper is always easier to write if you're interested in the topic, and you'll be more motivated to do in-depth research and write a paper that really covers the entire subject. Even if a certain research paper topic is getting a lot of buzz right now or other people seem interested in writing about it, don't feel tempted to make it your topic unless you genuinely have some sort of interest in it as well.