1.   flute   guitar   trumpet   bugle   Hint Half-n-half Clue   2.   iron   aluminum   carbon   copper   Half-n-half Clue   3.   Pluto   Earth   Mars   Moon   Half-n-half Clue   4.   29th February 2000   31st August 1997   29th April 1998   31st June 1999   Half-n-half Clue   5.   run   walk   jog   sit   Half-n-half Clue   6.   chair   sofa   table   stool   Half-n-half Clue   7.   water   pond   lake   pool   Half-n-half Clue