Q: Santa Claus and his elves distributed millions of presents worldwide to the children of the world, but they do not all believe in them being able to give presents worldwide in a night.
Who they is?
A: the children of the world

Q: The professor highly recommends the student because he appreciates an inquisitive mind.
Who he is?
A: The professor

Q: John chose Bill because he was choosing.
Who he is?
A:
John