Good Riddles

Question: Take my first and make it my last, now I happened in the past.

What am I?

Question: 5 bricks construct me, you'll find a candle in the middle. I am the antithesis of heavy, Without me you couldn't read the riddle. What am I?

Question: An electric train is traveling south. Which way does the smoke go?

Question: A father's child. A mother's child. no one's son.

Who am I?

Question: You can rest on my pad without touching the keys.
I will sing all month long as long as you pay your fees.

What am I?