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To answer the questions, we need to analyze the pronunciation of each word, focusing on the underlined part and identify which one differs from the other three. Question 1: A. extreme B. excellent C. execute D. exercise - extreme: ɪkˈstrim - excellent: ˈɛksələnt - execute: ˈɛksəkjut - exercise: ˈɛksərsaɪz In this case, "extreme" is the one that differs from the other three in pronunciation, specifically the underlined part "ex". The other three options (B, C, and D) have "ex" pronounced as /ɛks/, whereas "extreme" has it as /ɪk/. So, the correct answer is A. Question 2: A. discuss B. issue C. fossil D. classroom - discuss: dɪˈskəs - issue: ˈɪʃu - fossil: ˈfɑsəl - classroom: ˈklæsrum Here, "issue" is the one that stands out, but upon closer inspection, we can see that "issue" is actually the only one that starts with the "i" sound pronounced as /ɪʃ/, whereas the other options start with different sounds: "dis-" (/dɪ/), "fos-" (/fɑ/), and "class-" (/klæ/). However, when looking at the underlined parts in the context of the question, we should consider that the question is asking about the underlined part's pronunciation. Therefore, a closer look reveals that it is actually "classroom" and "fossil" that share a similar pronunciation pattern with "discuss" having the same vowel sound in the first syllable (/ɪ/ or /ɑ/ or /æ/) followed by a consonant cluster or a single consonant and then a vowel sound, whereas "issue" is the odd one out with the "i" followed by the "sh" sound (/ʃ/). So, the correct answer is B. Question 3: A. pesticide B. impact C. focus D. practical - pesticide: ˈpɛstəsaɪd - impact: ˈɪmpækt - focus: ˈfoʊkɪs - practical: ˈpræktɪkəl In this case, the underlined part that differs from the other three in pronunciation is in the word "pesticide". The other options all start with the "i" sound (/ɪ/), the "f" sound (/foʊ/), and the "pr" sound (/pr/), but "pesticide" starts with the "p" sound (/p/), followed by "est-". However, the closer look reveals that the first syllable in "pesticide", "impact", "focus", and "practical" all have a different vowel sound (/ɛ/, /ɪ/, /oʊ/, /æ/). The odd one out is actually "impact" which has a different vowel sound (/ɪ/). Here are the answers to each question: Question 1: Analyze: - 'awareness' stressed at second syllable - 'illegal' stressed at second syllable - 'importance' stressed at second syllable - 'atmosphere' stressed at first syllable Therefore, 'atmosphere' has a different stress position to other words. Answer: D. atmosphere Question 2: Analyze: - 'environment' stressed at second syllable - 'electrical' stressed at second syllable - 'ecosystem' stressed at first syllable - 'material' stressed at second syllable Therefore, 'ecosystem' and 'material' have different stress positions, however, the question ask for only one answer, in that case 'ecosystem' is correct. Answer: C. ecosystem Question 3: Analyze: - 'natural' stressed at first syllable - 'chemical' stressed at first syllable - 'atmosphere' stressed at first syllable - 'solution' stressed at second syllable Therefore, 'solution' has a different stress position to other words. Answer: D. solution Here are the answers to the vocabulary and grammar questions: 1. A. threat 2. A. keep 3. B. on 4. A. aware 5. B. Air pollution 6. A. had done / following 7. B. what that word means 8. D. where did I come from? 9. C. if 10. B. what was the matter