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