1. **Taking** vitamins can help supplement your daily nutrition. (ADDITION)
- **Addition**: "Addition of"

2. Drinking plenty of water is an **appropriate** way to stay hydrated. (APPROPRIATELY)
- **Appropriately**: "Appropriate"

3. A **distraction** like social media can prevent me from getting enough exercise. (DISTRACT)
- **Distract**: "Distraction"

Here are the completed sentences with the appropriate words:

1. Taking vitamins can help supplement your daily nutrition. **Addition** of vitamins plays a crucial role in maintaining a balanced diet.
2. Drinking plenty of water is an **appropriate** way to stay hydrated.
3. A **distraction** like social media can prevent me from getting enough exercise.