Using Only Five 5's and any mathematical operator make sum as 37

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's the only room from which no one can enter or leave

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

How is a fly different from a mosquito?

A person was killed at a house party. When the police arrive, there are six people present in the house who are the friends of the victim. The name of the friends is Rohit, Aman, Nick, Gagan, and Randy.

Near the dead body, they find a few numbers written with blood by the victim on the floor. The numbers are 8, 5, 4, and 11.

The police arrests one of the friends for the murder. Whom did they arrest and why?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?