Which one is the topic sentence? 1. My high school was one of the best in the country. 2. The average score for my class on the Scholastic Aptitude Test was 615 out of 800 on the verbal part and 675 on the math part. 3. This compares to only 419 and 473 nationally. 4. Last year, 51% of my class were National Merit Scholars. 5. This is unheard of at any other school.