1. trigonometry   san [jia;jiao;jue] xue   [de;di] zhi   tian wen   dong wu xue   Hint Half-n-half Clue   2. zoology   dong wu xue   zhi wu xue   sheng wu   [hua;hua] xue   Half-n-half Clue   3. psychology   wu li   xin li xue   li shi   sheng wu   Half-n-half Clue   4. algebra   zhi wu xue   [ji;ji] [he;he]   dai [shu;shu;shuo]   tian wen   Half-n-half Clue   5. geography   wu li   wei ji [fen;fen]   dong wu xue   [de;di] li   Half-n-half Clue   6. astronomy   wu li   [de;di] li   dai [shu;shu;shuo]   tian wen   Half-n-half Clue   7. geology   [ji;ji] [he;he]   [de;di] zhi   san [jia;jiao;jue] xue   [hua;hua] xue   Half-n-half Clue