Answer:
I am a word. I become longer when the third letter is removed. What am I?
The more you take away from me the bigger I shall get.
Never ahead, ever behind, yet flying swiftly past, for a child, I last forever, for adults, I'm gone too fast.
I have no wallet but I pay my way. I travel the world but in a corner I stay. What am I?
I am heavy forward, but backward I'm not. What am I?
When is it bad luck to see a black cat?