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

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

What two things can you never eat for breakfast?

The King of a distant land had heard that Birbal was one of the wisest men in the East and so desired to meet Birbal. He sent Birbal an invitation to visit his country.

In due course, Birbal arrived in the distant kingdom. When he entered the palace he was flabbergasted to find not one but six kings seated there. All looked alike. All were dressed in kingly robes. Who was the real king?

The very next moment he got his answer. Confidently, he approached the king and bowed to him.

How did Birbal know who was the real king?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

who is silent in the parliament?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Why is a river so rich ?