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