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Based on the provided IPA notations, here are the analyses and answers: 1. A. single: ˈsɪŋgəl B. environment: ɪnˈvaɪrənmənt C. dioxide: daɪˈɑksaɪd D. device: dɪˈvaɪs The underlined part refers to the stress pattern. Single has the stress on the first syllable, while the other options have stress on the second syllable. However, considering the actual vowel sound, "environment" has "ɪn" at the beginning, while the other options start with a "d" sound followed by different vowel sounds. Yet, "single" clearly has a distinctively different vowel sound "ɪ" compared to the more open or diphthong sounds in the other options. Considering the options more closely, it's the vowel sound in "single" that's more distinct, but also consider the more consistent difference in the consonant-vowel sound, single starts with an "s" and a short "i". Single does stand out but the best answer may be "environment". environment's first vowel is "ɪ" which is more like the "i" in "bit", whereas the other options have more open or diphthong sounds, which may lead to a more distinct sound. Answer: B Here are the answers to each question: 1. QUESTION: Choose the word which is stressed differently from the others. A. problem B. global C. species D. protect Analyze: 'problem' stressed at first syllable 'global' stressed at first syllable 'species' stressed at first syllable 'protect' stressed at second syllable Therefore, 'protect' has a different stress position to other words. Answer: D. protect 2. QUESTION: Choose the word which is stressed differently from the others. A. digital B. conference C. Japanese D. difficult Analyze: 'digital' stressed at first syllable 'conference' stressed at first syllable 'Japanese' stressed at third syllable 'difficult' stressed at first syllable Therefore, 'Japanese' has a different stress position to other words. Answer: C. Japanese 3. QUESTION: Choose the word which is stressed differently from the others. A. product B. plastic C. single D. avoid Analyze: 'product' stressed at first syllable 'plastic' stressed at first syllable 'single' stressed at first syllable 'avoid' stressed at second syllable Therefore, 'avoid' has a different stress position to other words. Answer: D. avoid 4. QUESTION: Choose the word which is stressed differently from the others. A. tornado B. endanger C. extinction D. habitat Analyze: 'tornado' stressed at second syllable 'endanger' stressed at second syllable 'extinction' stressed at second syllable 'habitat' stressed at first syllable Therefore, 'habitat' has a different stress position to other words. Answer: D. habitat 5. QUESTION: Choose the word which is stressed differently from the others. A. protection B. pollution C. endanger D. animal Analyze: 'protection' stressed at second syllable 'pollution' stressed at second syllable 'endanger' stressed at second syllable 'animal' stressed at first syllable Therefore, 'animal' has a different stress position to other words. Answer: D. animal 6. QUESTION: Choose the word which is stressed differently from the others. A. participate B. activity C. celebrate D. environment Analyze: 'participate' stressed at second syllable 'activity' stressed at second syllable 'environment' stressed at second syllable 'celebrate' stressed at first syllable Therefore, 'celebrate' has a different stress position to other words. Answer: C. celebrate Here are the correct answers for each sentence: 1. On her arrival _____ the airport, she called me. Answer: D. at 2. When I make a _____ to my mother with my smartphone, I can see her on the phone screen. Answer: B. video call 3. A(n) _____ is one where all the participants are physically in the same place. Answer: D. face-to-face meeting 4. _____ is small digital image or icon used to express an idea, emotion, etc. Answer: D. Emoji 5. Please leave a _____ on my phone if you are unable to reach me. Answer: A. message 6. At the current time, humans do not have the _____ capacity to communicate by thought. Answer: A. telepathy 7. Students can call or _____ the school for information about the academic year. Answer: C. email 8. Many people think translation machines will replace _____ in the future. Answer: B. human translators 9. Parents should pay due attention to their children's use of _____ Answer: C. social networking sites 10. It's not _____ fault. It's _____. Answer: B. yours-mine 11. I left a message _____ your answering machine. Answer: on (no option for 'on' in the original prompt; correct preposition is indeed 'on') 12. Due to habitat loss, some species are at a high risk of _____. Answer: extinction (no options were provided, but the most suitable answer would be 'extinction')