Can you find the missing piece of the Porsche?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

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

What have one eye but still cannot see?

If a wheel has 54 spokes, how many spaces are there between the spokes?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?