Question 1:
historic: /ˈhɪˈstɔːrɪk/ - The underlined part is pronounced as the short /ɪ/ sound.
exciting: /ɪkˈsaɪtɪŋ/ - The underlined part is also pronounced as the short /ɪ/ sound.
island: /ˈaɪlənd/ - The underlined part is pronounced as the long /aɪ/ sound.
firework: /ˈfaɪərwɜːrk/ - The underlined part is pronounced as the long /aɪ/ sound.
Answer: a. historic, b. exciting have a different sound from the others.
Question 2:
calendar: /ˈkæləndər/ - The underlined part is pronounced as the short /æ/ sound.
celebrate: /ˈsɛləbreɪt/ - The underlined part is pronounced as the short /ɛ/ sound.
decorate: /ˈdɛkəreɪt/ - The underlined part is pronounced as the short /ɛ/ sound.
school: /skuːl/ - The underlined part is pronounced as the long /uː/ sound.
Answer: d. school has a different sound from the others.
Question 3:
wonder: /ˈwʌndər/ - The underlined part is pronounced as the short /ʌ/ sound.
compass: /ˈkʌmpəs/ - The underlined part is pronounced as the short /ʌ/ sound.
brother: /ˈbrʌðər/ - The underlined part is pronounced as the short /ʌ/ sound.
forest: /ˈfɒrɪst/ - The underlined part is pronounced as the long /ɔː/ sound.
Answer: d. forest has a different sound from the others.
Question 4:
beach: /biːtʃ/ - The underlined part is pronounced as the long /iː/ sound.
teach: /tiːtʃ/ - The underlined part is pronounced as the long /iː/ sound.
feather: /ˈfɛðər/ - The underlined part is pronounced as the short /ɛ/ sound.
peaceful: /ˈpiːsfəl/ - The underlined part is pronounced as the long /iː/ sound.
Answer: c. feather has a different sound from the others.
Question 5:
clothes: /kləʊðz/ - The underlined part is pronounced as the long /ōʊ/ sound.
fireworks: /ˈfaɪərwɜːks/ - The underlined part is pronounced as the long /ɜː/ sound.
scissors: /ˈsɪzərz/ - The underlined part is pronounced as the short /ɪ/ sound.
mountains: /ˈmaʊntənz/ - The underlined part is pronounced as the long /aʊ/ sound.
Answer: All options have different sounds.