THREE RHYMING RIDDLES

1)
It runs and runs, but can never flee,
It is often watched, but never sees.

2)
My first is in fish, but not in snail,
My second in rabbit, but not in tail;
My third is in up, but not in down,
My fourth in tiara, but not in crown.
My fifth is in tree, you plainly see,
My whole a food for you and me.

3)
Through my first forever flow
Peals of laughter, cries of woe;
In my second, both east and west,
Thousands come each night to rest.
In my whole, men never jest,
Vows are uttered, sins confessed.

Answers:

1. Time
2. Fruit 
3. Earnest (EAR + NEST)