Answer:
I contain six letters minus one and you got twelve.
I have 24 keys but cannot open any locks. Sometimes loud sometimes soft
I am of several different kinds, but the one you pick doesn't do its job. What am I?
I can be swallowed But I can also swallow you.
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
What made Cyclops quit teaching?