Articles Exercise 22

Choose A, AN, THE or (/) for "no article" for each blank below, then click the "Check" button to check your answers.
Most people outside United States have never heard of Great Serpent Mound in Adams County, Ohio. One of most mysterious monuments in America, mound is ancient Native American construction built to look like snake. While there are mounds built in many parts of Midwest and South, not many look like animals. Researchers refer to this type of mound as "effigy mound".

Over 1,348 feet long, scientists agree it's very impressive monument, but there is disagreement over who built structure. Some people think Adena people built mound; others think it was Fort Ancient culture.
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