Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

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?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What word begins and ends with an E, but has only one letter?

Who can jump higher than a Mountain?

What goes up but never comes down?

Buy me, smell me or deliver me, I do not change.

Who am I?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?