What can you catch but never throw?

You can see it everyday, But cannot touch it at will. What is it?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

There is something which is always coming but never arrives?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

What goes up but never comes down?