4. A. simultaneous             B. feedback                   C. different                   D. errors

3. A. promise                     B. expensive                 C. constructive              D. original

2. A. forests                       B. singing                     C. concerning               D. burning

1. A. superman                  B. synthetic                   C. conversion                D. professor

10. A. cultural                      B. mischievous              C. interesting              D. responsible

9.   A. conical                       B. different                     C. symbolic                 D. careful

8.   A. beautiful                    B. terrific                       C. wonderful               D. marvelous

7.   A. simple                       B. polite                         C. formal                     D. instant

6.   A. secondary                  B. immediate                 C. miraculous              D. domestic

5.   A. independent               B. academic                   C. compulsory            D. unexpected