I. Circle the word that has the underlined part pronounced differently from the others in each group.
1. ​A. promise​B. horse​C. exercise​D. practice
2. ​A. monkey​B. money​C. donkey​D. ink
3. ​A. teenage​B. luggage​C. image​D. damage
4. ​A. pretty​B. precious​C. preservation​D. preparation
5. ​A. environment​B. device​C. provide​D. service