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?

How can a man go eight days without sleep?

What has many keys but can’t open a single lock?

what's the probability of getting a king or a queen from a pack of 52 cards?

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

If two's company, and three's a crowd, then whats four and five ?

Which is the rope you never skip with?

What can jump higher than a building?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den