Exercise 1: Choose the word whose underlined part is pronounced differently from that of the others.
1. A. girl B. learn C. bird D. open                              2. A. enough B. laugh C. though D. cough
3. A. watch B. headache C. change D. children         4. A. know B. king C. knife D. knowledge
5. A. iron B. bird C. first D. birthday
Exercise 2: Choose the word whose main stress pattern is placed differently.
1. A. collect B. volunteer C. enjoy D. donate            2. A. sunburn B. flooded C. allergy D. unique
3. A. charity B. energy C. dislike D. sickness

4. A. monopoly B. non-profit C. well-known D. organization

5. A. itchy B. graffiti C. traffic D. blanket