1. 橡皮擦   pen   chalk   paper   eraser   Hint Half-n-half Clue   2. 统治者   pencil sharpener   ruler   textbook   grade   Half-n-half Clue   3. 课本   library   desk   pencil sharpener   textbook   Half-n-half Clue   4. 笔记本   ruler   classmate   notebook   eraser   Half-n-half Clue   5. 铅笔   pen   bag   pencil   school   Half-n-half Clue   6. 黑板   eraser   blackboard   textbook   ruler   Half-n-half Clue   7. 纸   crayon   paper   blackboard   grade   Half-n-half Clue