Solve below rebus puzzle?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What goes through cities and fields, but never moves?

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

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

These types of puzzles are known as charades. What you have to do is to 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 the '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.

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What number should come in place of the question mark below?