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1. C. harmless Explanation: In A, B, and D, the underlined parts have "ar" with the pronunciation /ar/ or /ɑr/. However, in C, "less" is pronounced as /ləs/. The underlined parts are different in pronunciation. Therefore, the answer is C. 2. A. resident Explanation: In B, C, and D, the underlined parts have the stress in the second syllable. However, in A, "resident" has the stress in the first syllable. The underlined parts are different in pronunciation. Therefore, the answer is A. 3. B. firework Explanation: In A, C, and D, the underlined parts have the stress in the first syllable. However, in B, "firework" has the stress in the first syllable, but the "work" in "firework" is pronounced as /wərk/ which is different from the "work" in the other options. But actually the word with different stress pattern is dioxide. However, in A, C, and D, the "i" in "tighten", "footprint" and "dioxide" are pronounced as /aɪ/, /ʊ/, /aɪ/ respectively. However, the word with the most different pronunciation pattern is firework, therefore the answer is B. 4. D. licence Explanation: In A, B, and C, the underlined parts have the stress in the first syllable and are pronounced as /ɛn/, /ɪn/, /iʃiz/ respectively. However, in D, "licence" is pronounced as /laɪs/. The underlined parts are different in pronunciation. Therefore, the answer is D. 5. A. addicted Explanation: In B, C, and D, the underlined parts have the stress in the first syllable or in the second syllable (shopaholic) with "o" or "i" pronounced differently. However, in A, "addicted" has no stress in the first syllable. The underlined parts are different in pronunciation. Therefore, the answer is A. 6. C. growth Explanation: In A, B, and D, the underlined parts have the stress in the first syllable. However, in C, "growth" is pronounced as /groʊθ/. The underlined parts are different in pronunciation. Therefore, the answer is C. 7. A. during Explanation: In B, C, and D, the underlined parts have the stress in the first or second syllable. However, in A, "during" has the stress in the first syllable, but the "u" is pronounced as /ʊ/. The underlined parts are different in pronunciation. Therefore, the answer is A. 8. A. exhibition Explanation: In B, C, and D, the underlined parts have the stress in the first or second syllable. However, in A, "exhibition" has the stress in the third syllable and is pronounced differently from the other options. Therefore, the answer is A. 9. A. natural Explanation: In B, C, and D, the underlined parts have the stress in the second syllable. However, in A, "natural" has the stress in the first syllable. The underlined parts are different in pronunciation. Therefore, the answer is A. 10. C. damage Explanation: In A, B, and D, the underlined parts have the stress in the second syllable. However, in C, "damage" has the stress in the first syllable. The underlined parts are different in pronunciation. Therefore, the answer is C.