Odd one out

Here are the odd ones out for each set based on the underlined parts:

1. **C. of** - It does not contain the "ur" sound found in the others.
2. **B. though** - The "ough" in this word has a different pronunciation compared to the others, which sound like "uff."
3. **A. machine** - The "ch" produces a "sh" sound, while the others have "ch" as a hard sound.
4. **A. chin** - Similar to the previous answer, the "ch" here has a different sound (soft) compared to the hard "ch" in the others.
5. **B. fast** - It does not contain the "ough" sound found in the others.

Let me know if you need further explanation!