What does this rebus riddle means ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?