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49. d. both a and c 50. c. Fortunately, the environment was untouched. Here are the answers to the questions: 1. The answer is 'd. innovate'. The underlined part is 'o' in each option, but in 'innovate', the 'o' is pronounced as 'əv', which is different from the others ('ɑ' in 'hobby', 'ɑ' in 'solid', and 'ɑ' in 'model'). 2. The answer is 'b. nuclear'. The underlined part is 'ea' in each option, but in 'nuclear', the 'ea' is pronounced as 'i', which is different from the others ('iː' in 'cheap' is pronounced like 'ea' in 'cheap', 'i' in 'heat', and 'iː' in 'clean'). However, it can be argued that 'heat' should be the correct answer since its 'ea' is pronounced like 'i' but in a different way from the 'i' in 'cheap', 'clean' and the 'i' in 'nuclear'. 3. The answer is 'c. pool'. The underlined part is 'oo' in each option, but in 'pool', the 'oo' is pronounced as 'u', which is different from the others ('ʊ' in 'poor', 'ʊ' in 'football', and 'ʊ' in 'neighborhood'). 4. The answer is 'a. recent'. The underlined part is 'e' in each option, but in 'recent', the 'e' is pronounced as 'i', which is different from the others ('e' is silent in 'efficient', 'a' in 'faucet', and 'e' is silent in 'receive'). 5. The answer is 'd. thing'. The underlined part is 'th' in each option, but in 'thing', the 'th' is pronounced as 'θ' (voiceless 'th'), which is different from the others ('ð' (voiced 'th') in 'them', 'ð' in 'this' is not an option but 'this' would have been an option which also has 'ð', 'θ' is voiceless 'th', 'ð' is the voiced counterpart) 6. a. faucet b. pollute c. respond d. relax Analyze: 'faucet' stressed at first syllable 'pollute' stressed at second syllable 'respond' stressed at second syllable 'relax' stressed at second syllable Therefore, 'faucet' has a different stress position to other words. Answer: a. faucet 7. a. solar b. recent c. prevent d. campus Analyze: 'solar' stressed at first syllable 'recent' stressed at first syllable 'campus' stressed at first syllable 'prevent' stressed at second syllable Therefore, 'prevent' has a different stress position to other words. Answer: c. prevent 8. a. standard b. provide c. control d. amount Analyze: 'standard' stressed at first syllable 'provide' stressed at second syllable 'control' stressed at second syllable 'amount' stressed at second syllable Therefore, 'standard' has a different stress position to other words. Answer: a. standard 9. a. economic b. limitation c. reputation d. infrastructure Analyze: 'economic' stressed at third syllable 'limitation' stressed at third syllable 'reputation' stressed at third syllable 'infrastructure' stressed at third syllable This group of words does not have a word that is stressed differently from the others. Answer: There is no word that meets the question. 10. a. unpolluted b. effectively c. inspiration d. mausoleum Note: Cannot find 'unpolluted' in dictionary Analyze: 'effectively' stressed at second syllable 'inspiration' stressed at third syllable 'mausoleum' stressed at third syllable This analysis is incomplete, because the stress position of 'unpolluted' is unknown. Answer: There is not enough information to answer the question. Here are the correct answers: 11. In spite of everyone disagreed with him → Despite everyone disagreeing with him (The correct phrase is 'despite everyone disagreeing with him', not 'in spite of everyone disagreed with him'.) 12. Most of children → Most children (We use 'most' directly before the noun without 'of'.) 13. Scientist believe → Scientists believe (The subject-verb agreement is incorrect; the correct form is 'Scientists believe'.) 14. a place to stay → a place to stay (this is correct, but) looking after → looking for (The correct phrase is 'looking for a place to stay', not 'looking after a place to stay'.) 15. life form → life forms (The subject-verb agreement is incorrect; the correct form is 'life forms'.) 16. dramatical → dramatically (The correct adverb is 'dramatically', not 'dramatical'.)