If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Which is the correct shadow of the bird?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

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

Before Mount Everest was discovered, what was the highest mountain in the world?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

I know a nine-letter word having only one vowel.
Do you ?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?