What has a ring but no finger?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

You can hear me, but you can't touch or see me.

What am I?

You were playing ping pong with your friend. Suddenly the ball fell into a narrow metal pipe that was imbedded in the concrete surface of the floor one foot deep. Now you don't have any other ball and you desperately want to take it out and play. You and your friend have your shoelaces, your tennis paddle and a plastic water bottle. However, the bottle cannot fit into the pipe.

How will you take the ball out?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

What has to be broken before you can use it?

Who can jump higher than a Mountain?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Replace the question mark with the correct number in the below-given picture?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?