Ex.4 Match the words (1-7) with the definitions (A-G). 1 bone 2 marrow 3 impacted 4 greenstick 5 compound 6 comminuted 7 stress fracture A having bone protruding through the skin B a minor crack in a bone C the breakage of a young, soft bone D a strong, hard part of a body's structure E having parts crushed together F A soft substance with immune functions G being broken into several pieces