Now write an introductory paragraph for your essay. Remember, your introductory paragraph introduces the reader to your topic. It should include your topic sentence, background information for the audience, and a thesis statement that summarizes the three main points.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

that they just take and use up resources all the time

explanation :

quizlet

the flighty purpose never is o'ertook / unless the deed go with it"