I'll analyze the pronunciation of each word and answer the question.
1. A. essay: ˈɛseɪ, B. classmate: ˈklæsmeɪt, C. craft: kræft, D. paragraph: ˈpɛrəgræf
The underlined part of "craft" is pronounced differently, as it starts with /kr/ sound, while the others start with a vowel or a different consonant sound.
2. A. test: tɛst, B. report: rɪˈpɔrt, C. project: ˈprɑʤɛkt, D. upset: ˈəpsɛt
The underlined part of "test" is pronounced differently, as it is pronounced with a short /ɛ/ sound, while the others have a different vowel sound or diphthong.
3. A. think: θɪŋk, B. thanks: θæŋks, C. although: ɔlˈðoʊ, D. math: mæθ
The underlined part of "although" is pronounced differently, as it starts with /ɔl/ sound, while the others start with the /θ/ sound.
4. A. presentation: prɛzənˈteɪʃən, B. invitation: ɪnvɪˈteɪʃən, C. education: ɛʤəˈkeɪʃən, D. question: kˈwɛʃən
The underlined part of "question" is pronounced differently, as it starts with /k/ sound followed by /w/, while the others start with a vowel sound or a different consonant sound.
5. A. really: ˈrɪli, B. reason: ˈrizən, C. teaching: ˈtiʧɪŋ, D. speaking: ˈspikɪŋ
The underlined part of "reason" is pronounced differently, as it has a /z/ sound, while the others have a different consonant sound or no /z/ sound.
6. A. school: skul, B. textbook: ˈtɛkstbʊk, C. cartoon: kɑrˈtun, D. teaspoon: ˈtispun
The underlined part of "school" is pronounced differently, as it ends with /ul/ sound, while the others have a different vowel sound or consonant sound at the end.
7. A. posters: ˈpoʊstərz, B. readers: ˈridərz, C. students: ˈstudənts, D. news: nuz
The underlined part of "news" is pronounced differently, as it is pronounced with a /uz/ sound, while the others end with /ərz/ sound.
8. A. grades: greɪdz, B. pictures: ˈpɪkʧərz, C. universities: junəˈvərsətiz, D. guesses: ˈgɛsɪz
The underlined part of "guesses" is pronounced differently, as it ends with /ɪz/ sound, while the others end with /z/ sound after a different vowel sound.
9. A. annoyed: əˈnɔɪd, B. delighted: dɪˈlaɪtɪd, C. disappointed: dɪsəˈpɔɪnɪd, D. decided: dɪˈsaɪdɪd
The underlined part of "decided" is pronounced differently, as it has a /saɪd/ sound, while the others have a different vowel sound or diphthong.
10. A. pleased: plizd, B. surprised: səˈpraɪzd, C. failed: feɪld, D. passed: pæst
The underlined part of "pleased" is pronounced differently, as it is pronounced with a /plizd/ sound, while the others have a different vowel sound or consonant sound.
11. Analyze:
'essay' stressed at second syllable
'project' stressed at first syllable
'homework' stressed at first syllable
'report' stressed at second syllable
Therefore, 'project' and 'homework' have a different stress position to other words.
Answer: B. project and C. homework
12. Analyze:
'annoyed' stressed at second syllable
'surprised' stressed at second syllable
'lonely' stressed at first syllable
'abroad' stressed at second syllable
Therefore, 'lonely' has a different stress position to other words.
Answer: C. lonely
13. Analyze:
'decline' stressed at second syllable
'project' stressed at first syllable
'although' stressed at second syllable
'upset' stressed at second syllable
Therefore, 'project' has a different stress position to other words.
Answer: B. project
14. Analyze:
'however' stressed at second syllable
'positive' stressed at first syllable
'negative' stressed at first syllable
'difficult' stressed at first syllable
Therefore, 'however' has a different stress position to other words.
Answer: A. however
15. Analyze:
'biology' stressed at second syllable
'geography' stressed at second syllable
'community' stressed at second syllable
'disappointed' stressed at third syllable
Therefore, 'disappointed' has a different stress position to other words.
Answer: D. disappointed
Here are the answers:
6. A. do
7. B. English
8. C. bought
9. D. difficult
10. A. study
11. D. Do-has to
12. C. have to