be sure of your answers

1. Question: What do you call a woman who knows where her husband is all the time?
2. Question: What do you sit on, sleep on, and brush your teeth with?
3. Question: What goes up and down, but always remains in the same place?
4. Question: What is it that goes up, but never comes down?
5. Question: What happened when the wheel was invented?
6. Question: What has a head, a tail, but does not have a body?
7. Question: Who is bigger, Mr. Bigger, Mrs. Bigger, or their baby?