1. D. The words "amazing", "memorable", and "embarrassing" have the underlined part pronounced as /i/, while "lack" is pronounced as /æk/.
2. A. The words "occupy", "unpleasant", and "underground" have the underlined part pronounced as /ɔ/, /ɛ/, and /ə/ respectively, while "structure" is pronounced as /ʊ/.
3. A. The words "coral" and "eco-tour" have the underlined part pronounced as /ɔ/ and no pronunciation provided for "eco-tour" respectively, while "confident" and "occupy" are pronounced as /ɑ/.
4. C. The words "occupied", "pursued", "extended" have the underlined part pronounced as /ɔɪ/, /u/, /ɛ/ respectively, while "explored" is pronounced as /ɔr/.
5. D. The words "lifestyle", "religious", and "basic" have the underlined part pronounced as /aɪ/, /ɪ/, and /eɪ/ respectively, while "thrilling" is pronounced as /ɪ/.
6. A. The words "generation", "extended", and "complex" have the underlined part pronounced as /eɪ/, /ɛ/, and /ɔ/ respectively, while "recognize" is pronounced as /e/.
7. C. The words "congestion", "promotion", "recognition" have the underlined part pronounced as /ɛ/, /oʊ/, and /ɪ/ respectively, while "observation" is pronounced as /eɪ/.
8. D. The words "household", "historic", "exhilarating" have the underlined part pronounced as /aʊ/, /ɔ/, and /ɪ/ respectively, while "heritage" is pronounced as /ɛ/.
9. A. The words "pursue", "nuclear", "monument", "communal" have the underlined part pronounced as /u/, /u/, /u/, and /u/ respectively, while "communal" is pronounced as /u/ and others have u as main stress except "pursue".
10. D. The words "priority", "castle", "ancient" have the underlined part pronounced as /ɔ/, /æ/, and /eɪ/ respectively, while "takeaway" has no pronunciation provided.
11. D. The words "religious", "generation", "congested" have the underlined part pronounced as /ɪ/, /eɪ/, and /ɛ/ respectively, while "gap" is pronounced as /æ/.
12. D. The words "oriented", "embarrassed", "deep-rooted" have the underlined part pronounced as /ɔɪ/, /ɛ/, and no pronunciation provided for "deep-rooted" respectively, while "founded" is pronounced as /aʊ/.
13. C. The words "visit", "observe", "preserve" have the underlined part pronounced as /ɪ/, /z/, and /z/ respectively, while "snorkel" is pronounced as /ɔr/.
14. D. The words "memorable", "explore", "helpless" have the underlined part pronounced as /ɛ/, /ɔr/, and /ɛ/ respectively, while "tent" is pronounced as /ɛ/.
15. B. The words "parachute", "itchy", "cheerful" have the underlined part pronounced as /u/, /ɪ/, and /ɪ/ respectively, while "ketchup" is pronounced as /ɛʧ/.
16. D. The words "leisure", "support", "pursue" have the underlined part pronounced as /ɛ/, /ɔ/, and /u/ respectively, while "suggest" is pronounced as /ʤɛ/.
17. D. The words "leader", "nuclear", "seabed" have the underlined part pronounced as /ɪ/, /u/, and /ɛ/ respectively, while "stream" is pronounced as /i/.
18. D. The words "ancient", "appear", "associated" have the underlined part pronounced as /eɪ/, /ɪ/, and /oʊ/ respectively, while "achieve" is pronounced as /i/.
19. B. The words "protected", "embarrassed", "awarded" have the underlined part pronounced as /ɛ/, /ɛ/, and /ɔ/ respectively, while "exhausted" is pronounced as /ɔ/.
20. B. The words "submitted", "helped", "exhilarated", "associated" have the underlined part pronounced as /m/, /ɛ/, /ɪ/, and /oʊ/ respectively, while "associated" is pronounced as /oʊ/.