In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

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

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Which is the correct shadow of the bird?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?