I. Choose the word which is pronounced differently from the others .
1. A . chemistry B. chair C. couch D. children
2. A. student B. bus C. duty D. unit
3. A . house B.about C.country D.our
4. A.clothes B.watches C. benches D. classes
5. A. clock B.come C. class D. city
6. A. chocolate B. classmate C. potato D. toothpaste
7. A. police B. accident C. ocean D. citadel
8. A. opposite B. foodstall C. desert D. sometimes
9. A. hotel B. weekend C. correct D. destroy
10. A. gymnast B. finger C. vegetable D. dangerous