I. Choose the words whose underlined part is pronounced differently from that of the others in each group.
1. A. second B. welcome C. collection D. improve
2. A. other B. colourful C. dolphin D. wonderful
3. A. food B. took C. cook D. look
4. A. fun B. uncle C. club D. aquarium
5. A. clever B. circus C. collect D. cushion
6. A. garnish B. drain C. tender D. sprinkle
7. A. grin B. dip C. slice D. grill
8. A. spread B. cream C. bread D. head
9. A. sugar B. stew C. sauce D. steam
10. A. grate B. shallot C. marinate D. staple
11. A. simmer B. grill C. whisk D. slice
12. A. cube B. tunnel C. manual D. pure
13. A. grate B. staple C. citadel D. occasion
14. A. spread B. measure C. breath D. break
15. A. delicious B. lemon C. pepper D. vegetable
16. A. opened B. closed C. contained D. finished
17. A. laughter B. sightseeing C. daughter D. fight
18. A. island B. foodstuff C. stream D. service
19. A. paper B. receipt C. complain D. envelop
20. A. official B. ocean C. convenient D. precious