Can you find the missing piece of the Porsche?

When is the top of a mountain similar to a savings account?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

What do you see in the given picture?

What has many teeth, but cannot bite?

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

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

My location can be determined by the below rebus.
So where am i ?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?