Question 15:         A. particular           B. circumstances      C. environment     D. advertisement

Question 14:         A. diversity            B. disastrous          C. circulate            D. alternative

Question 13:         A. cultural              B. priority              C. advantage          D. occurrence

Question 12:         A. endanger           B. geometry           C. opposite            D. geography

Question 11:         A. permanent         B. continue            C. complete           D. relationship

Question 10:         A. informal            B. supportive         C. personnel          D. apparent

Question 9:           A. canal                  B. limit                   C. mammal            D. elbow

Question 8:           A. available            B. kindergarten      C. attractiveness    D. contractual

Question 7:           A. industry             B. sacrifice             C. ancestor             D. determine

Question 6:           A. politician           B. genetics             C. artificial            D. controversial