If you say my name, I will no longer exist. What am I?

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?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

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

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

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?