D. Write the correct article in parentheses to complete each sentence. 6. A mammoth is ( \( \mathrm{a}, \mathrm{an} \) ) extinct elephant from long ago. 7. Jorge visited ( t . l, an) Natural History Museum. 8. Those fossils are the oldest in ( a, the) museum. 9. I wrote \( (\mathrm{an}, \mathrm{a}) \) essay about dinosaurs. 10. I read \( (\mathrm{a}, \mathrm{an}) \) book about this museum's his.

Let's complete each sentence with the correct article: 6. A mammoth is **(a)** extinct elephant from long ago. - Explanation: "Mammoth" starts with a consonant sound, so we use "a." 7. Jorge visited **(the)** Natural History Museum. - Explanation: "Natural History Museum" is a specific place, so we use "the." 8. Those fossils are the oldest in **(the)** museum. - Explanation: Referring to a specific museum, we use "the." 9. I wrote **(an)** essay about dinosaurs. - Explanation: "Essay" starts with a vowel sound, so we use "an." 10. I read **(a)** book about this museum's history. - Explanation: "Book" starts with a consonant sound, so we use "a." Here are the completed sentences: 6. A mammoth is **a** extinct elephant from long ago. 7. Jorge visited **the** Natural History Museum. 8. Those fossils are the oldest in **the** museum. 9. I wrote **an** essay about dinosaurs. 10. I read **a** book about this museum's history.