1. san [jia;jiao;jue] xue   trigonometry   botany   philosophy   biology   Hint Half-n-half Clue   2. dong wu xue   chemistry   philosophy   algebra   zoology   Half-n-half Clue   3. dai [shu;shu;shuo]   geology   algebra   biology   chemistry   Half-n-half Clue   4. [de;di] li   history   physics   zoology   geography   Half-n-half Clue   5. zhe xue   zoology   geometry   botany   philosophy   Half-n-half Clue   6. sheng wu   chemistry   geometry   biology   trigonometry   Half-n-half Clue   7. wei ji [fen;fen]   geometry   philosophy   calculus   physics   Half-n-half Clue