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Which word sounds differently among those ones in the line?

1. Which of these words has a different ‘o’ sound?
a. do b. so c. go d. no
2. Which of these words has a different ‘wh’ sound?
a. where b. who c. why d. what
3. Which of these words has a different ‘oo’ sound?
a. book b. good c. door d. foot
4. Which of these words has a different ‘s’ sound?
a. sad b. sugar c. see d. soon
5. Which of these words has a different ‘i’ sound?
a. like b. write c. bite d. machine
6. Which of these words has a different ‘ea’ sound?
a. seat b. great c. neat d. meat