I.Choose the word whose underlined part has a different pronunciation from the others in each group:
1/A. chemist B. change C. child D. cheap
2/A. fork B. world C. sport D. north
3/A. plenty B. fairy C. sky D. weekly
4/A. feather B. head C. healthy D. meat
5/A. much B. cute C. cut D. sun
6/A. soften B. fifteen C. enter D. party
7/A. now B. how C. know D. down
8/A. this B. mine C. file D. night
9/A. when B. settle C. become D. fellow
10/A. where B. here C. fear D. dear