Kids Riddles

Question: A man is doing some work on his home and goes to a hardware store. He goes up to the clerk and tells him what he wants. The clerk tells him that each one is $1. He tells the clerk he would like 5000 and he is charged only $4.

What did he buy?

Question: My boots can fit though the green glass doors but my shoes cannot. Sea weed can fit but algae cannot. A tree can fit but a forest cannot. The moon can fit but a feather cannot. Why is this?

Question: If you have a cake, how many pieces of cake can you form with 3 straight cuts?

Question: Draw, fire, or fill me;
I'm still empty.

What am I?

Question: what did the postman say to the mailbox?