1.

What goes around the world, but stays in one corner? 

a plane
a stamp
the moon

2.

What has an eye, but can't see?

a lighthouse
a face 
a needle

3.

What do you add to oil that makes it boil? 

the letter B
a little sugar
some water

4.

I have a head and a tail, but no body. 

a coin
a monkey 
a family 

5.

How long is it from two to two to two two? 

two minutes
four minutes 
two hours