What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

What brings you down but never up?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What has 13 hearts but no other organs?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Why do Chinese men eat more rice than Japanese men do ?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

A sundial has the fewest moving parts of any timepiece. Which has the most?