1. astronomie   geology   astronomy   geometry   biology   Hint Half-n-half Clue   2. chimie   zoology   history   chemistry   geography   Half-n-half Clue   3. calcu   calculus   geology   algebra   astronomy   Half-n-half Clue   4. géographie   geology   astronomy   geography   psychology   Half-n-half Clue   5. biologie   psychology   biology   chemistry   geology   Half-n-half Clue   6. trigonométrie   geography   philosophy   trigonometry   zoology   Half-n-half Clue   7. psychologie   psychology   trigonometry   geology   algebra   Half-n-half Clue