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4/ Look at those clouds! There's a storm _______.

        A. threat                     B. threaten                  C. threatening              D. threateningly

5/ It was a long and _______ battle and many men were killed.

        A. blood                      B. bloody                     C. bleed                       D. bleeding

6/ I hope they'll have the good _______ to shut the windows before they leave.

        A. sense                      B. sensitive                 C. sensible                  D. senseless

7/ The story is set in an _______ world.

        A. image                     B. imagine                   C. imaginative             D. imaginary

8/ The program traced the _______ of popular music through the ages.

        A. develop                  B. developed               C. developing              D. development

9/ The firm produces kits for amateur car _______.

        A. construct                B. constructors            C. constructive            D. construction

10/ Most zoos try to exhibit animals in _______ settings.

        A. nature                     B. natural                    C. naturalize                D. naturalistic