Choose the word whose underlined part is pronounced differently from that of the other words:
1. A. iron B. grass C. rat D. green
2. A. holiday B. vehicle C. hello D. rehearsal
3. A. happy B. holly C. honest D. hollow
Choose the word whose main stress is placed differently from the others in each group:
4. A. discriminate B. ancestor
C. tragedy D. accurate
5. A. society B. physicist
C. magazine D. company
6. A. although B. mature C. enough D. access