Sure! Here are the answers for both exercises:

**Ex1: Choose one of the words whose underlined part is pronounced differently from the others.**
1. C. school (The "oo" in "school" is pronounced /uː/, while the others have a different vowel sound.)
2. D. climbed (The "ed" in "climbed" is pronounced /d/, while in the other words, it is pronounced /t/ or /ɪd/.)
3. C. cloth (The "o" in "cloth" is pronounced as /ɔː/, while the others have a different vowel sound.)

**Ex2: Choose the word whose stress pattern is different from that of the other words in each group.**
1. D. aerobics (This word has the stress on the second syllable, while the others have the stress on the first syllable.)
2. A. hotel (This word typically has the stress on the second syllable, while the others have the stress on the first syllable.)

Let me know if you need further clarification!