I. Find the word which has a different sound in the part underlined. 1. A. bird B. girl C. first D. sister 2. A. burn B. sun C. hurt D. turn 3. A. nurse B. picture C. surf D. return 4. A. headache B. architect C. chemical D. children 5. A. aerobics B. calories C. cycling D. doctor 6. A. tutor B. volunteer C. computer D. community 7. A. certain B. compare C. encourage D. community 8. A. charity B. chemistry C. chemical D. mechanic 9. A. discussion B. decision C. treasure D. vision 10. A. saxophone B. music C. so D. expensive