II. Choose the word whose main stressed syllable is placed differently from that of the other in each group.
1. A. mysterious B. generous C. extensive D. pollution
2. A. exchange B. purpose C. casual D. fashion
3. A. efficiency B. environment C. communicate D. reputation
4. A. encourage B. pagoda C. material D. grocery
5. A. provide B. prevent C. cover D. receive
6. A. adorable B. ability C. impossible D. entertainment
7. A. comedian B. document C. location D. perspective
8. A. experience B. material C. ability D. scientific
9. A. punctual B. utterance C. occurrence D. tolerant
10. A. attractive B. cultural C. perception D. expensive
11. A. spacecraft B. experienced C. planet D. scientist
12. A. example B. marvelous C. system D. maintenance
13. A. atmosphere B. together C. interested D. countryside
14. A. perform B. experiment C. instrument D. throughout
15. A. astronaut B. satellite C. impressive D. maintenance