People put me on the table and cut me but do not eat me. What am I?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

What can you hold in your right hand, but never in your left hand?

How many letters are in the alphabet?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

You need to cut a round cake into eight equal pieces with just 3 cuts. Can you do it?

What is the largest number you can write with just 3 digits?