ADJECTIVE OR ADVERB 1. The first bridges humans used were NATURAL.

2. A tree trunk might lie CONVENIENTLY across a stream.

3. One could NERVOUSLY cross a stone bridge over a canyon.

4. Someone swung DARINGLY across a river on a twisted vine.

5. 5.The stone bridges of the Romans are still VISIBLE.

6. Bridges were NECESSARY for military operations and communication.

7. Too much rhythmic shaking was BAD for a bridge.

8. That's why soldiers USUALLY broke step as they crossed a bridge.

9. Some Roman bridges still operate WELL after hundreds of years.

10. Their engineering skills were AMAZING.