Good 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: Why does the second shape have an open block when the first shape does not?

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: Why is the longest nose 11 inches?