What does this rebus riddle means ?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What is red and smells like blue paint?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Forwards I am heavy, backward I am not. What am I?

What's a single-digit number with no value?

O_er_t_o_

Complete the missing letters of the given word.