1. People in my country are very warm and friendly. - "Friendly" is the correct adjective to describe people who are kind, welcoming, and easy to get along with. 2. An orphan is a child whose parents are dead. - An "orphan" is a term used to describe a child who has lost both of their parents. 3. L.A Hill is a humorous writer. - "Humorous" is the correct adjective to describe someone or something that is funny or has a sense of humor. 4. I'm extremely sorry for the delay. - "Extremely" is an adverb used to intensify the degree of the adjective "sorry," indicating a high level of regret or apology. 5. She looks more beautiful than her sister. - "Beautiful" is the correct adjective to describe someone who is attractive or pleasing to the eye. 6. I am lucky enough to have a lot of friends. - "Lucky" is the correct adjective to describe someone who has good fortune or is fortunate in a particular situation. 7. They enjoy the peaceful summer evenings in the countryside. - "Peaceful" is the correct adjective to describe a situation or environment that is calm, quiet, and free from disturbance. 8. Those cats look lovely. - "Lovely" is the correct adjective to describe something or someone that is attractive, beautiful, or pleasing. 9. It was generous of him to offer to pay for us both. - "Generosity" is the correct noun form of the adjective "generous," which describes someone who is willing to give or share without expecting anything in return. 10. Role-play is helpful in developing communication skills. - "Helpful" is the correct adjective to describe something that provides assistance or aid in achieving a particular goal or outcome. In this case, role-play is beneficial for improving communication skills.