A few riddles for you to help me to figure out!!!

First Riddle:

Who makes it, has no need of it.
Who buys it, has no use for it.
Who uses it can neither see nor feel it.
What is it?

 

Second Riddle:

A basket contains 5 apples. Do you know how to divide them among 5 kids so that each one has an apple and one apple stays in the basket?

 

Third Riddle:

There are a few trees in a garden. On one of them, a pear tree, there are pears (quite logical). But after a strong wind blew, there were neither pears on the tree nor on the ground.
How come?

Fourth Riddle:
 

A poor farmer went to the market to sell some peas and lentils. However, as he had only one sack and didn't want to mix peas and lentils, he poured in the peas first, tied the sack in the middle, and then filled the top portion of the sack with the lentils. At the market a rich innkeeper happened by with his own sack. He wanted to buy the peas, but he did not want the lentils.
Pouring the seed anywhere else but the sacks is considered soiling. Trading sacks is not allowed. The farmer can't cut a hole in his sack.
How would you transfer the peas to the innkeeper's sack, which he wants to keep, without soiling the produce?