I. Choose the word whose main stressed syllable is placed differently from that of the other in each group.
11. A. essay
B. project
C. homework
D.report
12. A. annoyed
B. surprised
C.lonely
D. abroad
13. A. decline
B. project
C. although
D. upset
14. A. however
B. positive
C. negative
D. difficult
15. A. biology
B. geography
C. community
D. disappointed
