一篇英语短文改错,英语好的请进.

一篇英语短文改错,英语好的请进.
That Saturday when I entered in an underpass,I ___
heard a beautiful sound.It makes me very happy.___
It was darkness there so I couldn't see where the sound ___
came from.I walked towards the corner.An old man was sitting ___
there,wears shabby clothes.He was playing Erhu.Oh,"it was ___
a beggar's",I thought.At that moment a man came by,dropped ___
one yuan in the beggar box.The old man stopped to ___
say "thank you".He then groped on the ground.___
While he found the box,he picked up the money.He ___
felt it and smiled.What beautiful the music was!It was ___
played by a blind person.I just admired him.___