Understanding the Sentence
The sentence “Hang the wet towel to _____” requires a word that logically completes the action of hanging a wet towel.

Why "Dry" is the Correct Choice
- **Function of the Action**:
- When a towel is wet, it needs to be dried.
- Hanging it up allows air to circulate, facilitating the drying process.
- **Contextual Relevance**:
- The word "dry" directly relates to the state of the towel.
- Using "dry" indicates the purpose of the action, which is to remove moisture.

Analysis of Other Options
- **Option A: Wet**
- This option is illogical because you wouldn’t hang a wet towel to make it wetter.
- **Option B: Dirty**
- While a towel can be dirty, the action of hanging it does not pertain to making it dirty; rather, it refers to drying.
- **Option D: None of these**
- This option implies that none of the other words fit, but "dry" indeed fits perfectly.

Conclusion
In summary, the most suitable word to fill in the blank is "dry," as it perfectly describes the intended outcome of hanging a wet towel. This choice reflects the necessity to dry the towel after use, which is a fundamental understanding for young learners in Class 1.