1. dong wu xue   history   chemistry   geometry   zoology   Hint Half-n-half Clue   2. li shi   trigonometry   algebra   history   philosophy   Half-n-half Clue   3. tian wen   physics   zoology   astronomy   chemistry   Half-n-half Clue   4. [de;di] li   geography   psychology   botany   geology   Half-n-half Clue   5. zhe xue   geometry   chemistry   physics   philosophy   Half-n-half Clue   6. sheng wu   geography   geology   biology   physics   Half-n-half Clue   7. [de;di] zhi   geology   psychology   biology   chemistry   Half-n-half Clue