Can you find out who is the kidnapper in below Picture and why, Explain ?

I am sure no one can have two things for dinner. what are they?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

What work can one never finish?

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

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?