Answer:
1. **Brave as a lion:** The soldier stood on the battlefield, brave as a lion, facing the incoming enemy forces.
2. **Fast as a cheetah:** The sprinter dashed across the track, fast as a cheetah, leaving competitors in the dust.
3. **Bright as the sun:** Her smile lit up the room, bright as the sun on a clear summer day.
4. **Busy as a bee:** The bustling market was as busy as a bee, with people moving hurriedly from stall to stall.
5. **Cold as ice:** His stare was cold as ice, sending shivers down her spine.
6. **Clear as crystal:** The water in the mountain stream was clear as crystal, allowing us to see the pebbles at the bottom.
7. **Quiet as a mouse:** Sneaking into the room, she was quiet as a mouse, hoping not to wake anyone.
8. **Happy as a clam:** After receiving good news, she was happy as a clam, radiating joy and contentment.
9. **Strong as an ox:** Despite the heavy load, he lifted it effortlessly, strong as an ox.
10. **Free as a bird:** With the responsibilities behind, he felt free as a bird, exploring new opportunities.
