Here are the words from each exercise that have the underlined part pronounced differently from the others:

1. C. corpse (the "or" is pronounced as /ɔ:/, while the others have /ɔː/ or /ɔ/)
2. C. portable (the second syllable "ta" is pronounced as /tə/ not like the others which do not have a schwa sound)
3. D. bottle (the "o" in bottle is pronounced as /ɒ/, while the others have /ɔː/)
4. B. portrait (the "trait" is pronounced /treɪ/, while the others have "o" pronounced as /ɒ/ or /ɔː/)
5. A. chopstick (the "ch" is pronounced /tʃ/, while the others start with consonant sounds)
6. D. audience (the "au" is pronounced as /ɔː/, whereas others have /ɒ/ or /ʌ/)
7. A. small (the "sm" creates a different sound, while others have distinct vowel sounds)
8. A. daughter (the "augh" is pronounced /ɔː/, whereas the others have /ɒ/)
9. A. board (the "oa" is pronounced /ɔː/, while others may have distinct vowel sounds)
10. A. body (the "o" is pronounced /ɒ/, while the others have different vowel sounds)

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