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14. A. enthusiasts 15. A. or -> "The cool science behind drone flight and control is fascinating, or these devices are becoming increasingly important in our daily lives" is incorrect here, it should be: "The cool science behind drone flight and control is fascinating, and these devices are becoming increasingly important in our daily lives". But it isn't provided as an option. A more likely option is "as" which isn't provided. A better fit from the options is: C. so. "The cool science behind drone flight and control is fascinating, so these devices are becoming increasingly important in our daily lives". A better fit is: A. or ->> B. and So I choose B 16. C. fascinating Here are the answers to the questions: 17. C. doing 18. C. Both 19. A. in 20. D. will be completed 21. D. likely To solve this question, we need to analyze the underlined part (in this case, the "th" sound) of each word. - those: ðoʊz (the "th" sound is pronounced as ð, which is the voiced dental fricative sound) - thanks: θæŋks (the "th" sound is pronounced as θ, which is the voiceless dental fricative sound) - father: ˈfɑðər (the "th" sound is pronounced as ð, which is the voiced dental fricative sound) - weather: ˈwɛðər (the "th" sound is also pronounced as ð, which is the voiced dental fricative sound) Since "thanks" is the only word with the voiceless dental fricative sound (θ), while the other words have the voiced dental fricative sound (ð), the correct answer is B. thanks. Analyze: 'gratitude' stressed at first syllable 'discussion' stressed at second syllable 'celebrate' stressed at first syllable However, 'oppos' is not a valid word. Answer: B The correct arrangement is: C - A - E - D - B (E is "It's been a long time since I last talked to you" from the given sentence choices that were not provided, so I assumed a generic ordering with E in the position where it makes the most sense for an English paragraph, typically an introductory sentence or the second sentence.)