Answer:
My first keeps time, my second spends time, my whole tells time.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
Hold the tail, while I fish for you.
What can you put in a barrel to make it lighter?
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?
What did the baby corn say to its mother?