1. ling xing   ray   concave   rhombus   oval   Hint Half-n-half Clue   2. ban qiu   convex   oval   hemisphere   prism   Half-n-half Clue   3. duan   convex   parallelogram   segment   straight line   Half-n-half Clue   4. guang [mang;wang]   parallel lines   prism   perpendicular lines   ray   Half-n-half Clue   5. qi [bian;bian] xing   concave   oval   heptagon   hemisphere   Half-n-half Clue   6. [leng;leng;ling] jing   parallel lines   ray   rhombus   prism   Half-n-half Clue   7. [bian;bian] yuan   pentagon   heptagon   straight line   edge   Half-n-half Clue