I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

what does the below math rebus puzzle mean?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

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

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

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.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I look at you, you look at me, I raise my right, you raise your left. What am I?