Here are the answers for both exercises:

**Ex1: Choose one of the words whose underlined part is pronounced differently.**
1. **C. school** (The "sc" in school is pronounced /skuːl/ whereas the other words have different starting sounds.)
2. **A. traveled** (The "ed" in traveled is pronounced /d/, while in surprised it is /zd/, and in worked and climbed it is /t/.)
3. **D. course** (The "ou" in "course" is pronounced /ɔː/, whereas in the other words it has an /aʊ/ sound.)
4. **B. down** (The "ow" in "down" is pronounced /aʊ/, while in "towel", "window", and "flower," it is pronounced /aʊ/ but the vowel combinations can be trickier as they follow more of an /oʊ/ or /aʊ/ sounds depending on accent.)
5. **A. cook** (The "oo" in "cook" has a /ʊ/ sound, while in "food," "too," and "pool," it has a /uː/ sound.)

**Ex2: Choose the word whose stress pattern is different from the others.**
1. **C. possible** (The others have stress on the second syllable: re-AL-ize, im-PROVE, and com-FOR-ta-ble.)
2. **C. prefer** (The others have stress on the second syllable: im-POR-tant, es-PE-cially, and IN-flu-ence.)
3. **C. abroad** (The others have first-syllable stress: GEN-eral, o-PIN-ion, and sur-PRISE.)

If you have further questions, feel free to ask!