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I. Find the word which has a different sound in the part underlined. 1. A. solar B. biogas C. hydroelectric D. environment Answer: A. solar The other three words have "i" sound (biogas: bi-, hydroelectric: haɪ-, environment: ɪn-). "solar: ˈsoʊlər" has an "oʊ" sound. 2. A. renewable B. energy C. plentiful D. electric Answer: B. energy The other three words have stress on the second syllable (renewable: riˈ-, plentiful: ˈplɛnɪ- , electric: ɪˈ-). "energy: ˈɛnərʤi" has stress on the first syllable. 3. A. abundant B. nuclear C. truck D. dump Answer: A. abundant The other three words have "ʊ" sound (nuclear: ˈnukliər, truck: trək, dump: dəmp). "abundant: əˈbəndənt" has "ə" sound. 4. A. power B. transport C. short D. report Answer: C. short The other three words have "aʊ" sound or "ɔ" sound (power: paʊər, transport: ˈtrænspɔrt, report: rɪˈpɔrt). "short: ʃɔrt" has "ɔ" sound but "transport" also has "ɔ" sound so the answer could be "transport" too because "transport" has a different sound of "a" from "power" and "report". 5. A. carbon B. hard C. large D. marry Answer: A. carbon The other three words have "ɑr" sound (hard: hɑrd, large: lɑrʤ, marray: marray). "carbon: ˈkɑrbən" has "ɑrbən" sound. 6. A. advantage B. atmosphere C. motorbike D. generate Analyze: 'advantage' stressed at second syllable 'atmosphere' stressed at first syllable 'motorbike' stressed at first syllable 'generate' stressed at first syllable Therefore, 'advantage' has a different stress position to other words. Answer: A. advantage 7. A. effective B. regular C. different D. serious Analyze: 'effective' stressed at second syllable 'regular' stressed at first syllable 'different' stressed at first syllable 'serious' stressed at first syllable Therefore, 'effective' has a different stress position to other words. Answer: A. effective 8. A. population B. education C. development D. satisfaction Analyze: 'population' stressed at third syllable 'education' stressed at third syllable 'development' stressed at second syllable 'satisfaction' stressed at third syllable Therefore, 'development' has a different stress position to other words. Answer: C. development 9. A. countryside B. natural C. changeable D. dioxide Analyze: 'countryside' stressed at first syllable 'natural' stressed at first syllable 'changeable' stressed at first syllable 'dioxide' stressed at second syllable Therefore, 'dioxide' has a different stress position to other words. Answer: D. dioxide 10. A. renew B. artificial C. unfortunate D. continuous Analyze: 'renew' stressed at second syllable 'artificial' stressed at third syllable 'unfortunate' stressed at second syllable 'continuous' stressed at second syllable Therefore, 'artificial' has a different stress position to other words. Answer: B. artificial