What is always in front of you but can’t be seen?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

They are three errirs in this question. Can you find them?

what does this picture(rebus) riddle means ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Can you solve the below geography rebus by decoding the below rebus ?

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?

What is black when you buy it, red when you use it, and gray when you throw it away?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?