1. a duck? It's a bird.
2. the Nile? It's a river.
3. a rabbit? It's an animal.
4. tennis? It's a game.
5. a rose? It's a flower.
6. a hammer? It is a tool.
7. a carrot? It is a vegetable.
8. Mars? It is a planet.
9. a trumpet? It is a musical instrument.
10. a pear? It is a fruit.