Here are the answers for the words with different sounds in the part underlined:

1. **C. celebrate** - The "cele" has a different sound compared to others.
2. **A. funny** - The "un" has a different sound compared to others.
3. **A. writes** - The "writ" has a different sound compared to others.
4. **C. big** - The "i" sound is different compared to others.

So the words with different sounds are:
1. C
2. A
3. A
4. C