1. She was born to... [dance]. 2. He's a natural. 3. She could do it in her sleep. 4. He knows it inside out. 5. She knows [New York] like the back of her hand. 6. She's a walking encyclopedia of... [philosophy]. 7. He's in a class of his own. 8. He's the best in the business. 9. She's very gifted. 10. He's a [chemistry] whiz.