Choose the word whose underlined part pronounced differently from the others

I.Choose the word whose underlined part pronounced differently from the others
1. A. unit  B. use  C. university  D. unchanged

2. A. ache  B. charity  C. charming  D. changeful

3. A. whole  B. whereas  C. whose  D. whom

4. A. slaughter  B. laughter  C. naughty  D. taught

5. A. service   B. office  C. device  D. practice
GIÚP MK GẤP, CẢM ƠN:3