Misc: In 2012 Transit of ---------- (between Earth and Sun) will occur.?

Questions

In which century did Marco Polo first travel to China?

In Greek mythology who was the twin brother of Castor?

Who lived in Ivor the Engines boiler?

Who said of Margaet Thatcher" I wouldnt say she is open minded on the middle east,so much as empty headed"?

Where was the Grand National run between 1916 and 1918?