Here are the sentences with the concrete nouns encircled (identified by bold text):1. Many of our heroes sacrificed their lives for the country.2. The loud thunder awakened the sleeping child.3. Basketball is a more popular sport than football in the Philippines.4. The efficiency of the waiters in the hotel impressed the tourists.5. There are orchids, roses, and other plants in Grandmother's garden.6. Some insects have several odd colors.7. Our country has many scenic spots which we have not seen yet.8. People from the East brought jewels and spices.9. Amy swept the entire driveway with enthusiasm.10. Burning garbage adds to air pollution.Concrete nouns are those that represent physical objects or things that can be perceived through the senses.