Who is that with a neck and no head, two arms and no hands? What is it?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

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

What's the only room from which no one can enter or leave

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

I have branches, but no fruit, trunk or leaves. What am I?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

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?