Answer:
What has many keys but can't open a single lock?
To you, rude would I never be, though I flag my tongue for all to see. What am I?
You can read me both ways I wear; One way it's a number reversed a snare.
I pass before the sun but make no shadow. What am I?
I am there when you sit, but gone when you stand. What am I?
Why is the letter B always cool?