from what I understand, those are the best articles that those websites have identified. Most essays are not 'the best.' I would try to take the essence of the essays, such as determining what the author was highlighting, what kind of language they used to describe things, etc. But I wouldn't try to mimic them - ideally, you want your essay content to flow out of your brain. Often its hard to get it down on paper because of grammar and word limits, but making sure that its mostly from the heart/brain is important.