1. The cat is hiding underneath a chair.

 2. They're sitting underneath an umbrella.

 3. She's protected from the sun underneath an umbrella.

 4. These gazelles are staying cool underneath a shady tree.

 7. He remains anonymous underneath his sunglasses.

(anonymous = unknown; a person whose identity is not revealed.)

 8. It's hard to tell if that's a man or a woman underneath all that make-up.