What Am I Riddles

Question: When you fall in me your as happy as could be, but you fall into depression when you lose me.

What am I?

Question: Change a long pause into a short one by doubling a letter.What are the words?

Question: what comes in hard comes out soft and you blow ???????????????????????????????????????/

Question: I have four wings, but cannot fly.
I never laugh and never cry;
On the same spot I'm always found, toiling away with a little sound.

What am I?

Question: Every dawn begins with me At dusk I'll be the first you see And daybreak wouldn't come without What midday centers all about Daisies grow from me I'm told And when I come I end all cold But in the sun I won't be found Yet still each day I'll be around What am I?