Answer:
What goes inside boots and outside shoes?
Nothing specific, but more than a few. This many clustered, together will do.
What is as light as a feather, but not even the strongest man on earth can't hold it for more than 1 c)minute?
When I type I tap these on the keys
Tickle with your fingers and a song it will sing. Be careful, though, you may break a string. What is it?
When is it bad luck to see a black cat?