Why is a river so rich ?

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?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

A bomb exploded in a room full of married couples and no one died. How?

What is the centre of gravity?

I am quite hot but become too cold if you remove the first two letters. What am I?

What begins with T, ends with T, and has T in it?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Make a sentence consisting of three words that have the whole alphabet.