Add or remove commas, if necessary, until the sentence has correct punctuation.
Goodness gracious I think Ulysses Klaue just finished
a 3000-piece puzzle!
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Goodness gracious, I think Ulysses Klaue just finished

a 3,000-piece puzzle!

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.