1.   aluminum   iron   carbon   copper   Hint Half-n-half Clue   2.   cow   low   now   how   Half-n-half Clue   3.   milk   cheese   butter   yoghurt   Half-n-half Clue   4.   January   August   December   November   Half-n-half Clue   5.   man   tree   mouse   paper   Half-n-half Clue   6.   guitar   harp   violin   trumpet   Half-n-half Clue   7.   sofa   stool   table   chair   Half-n-half Clue