Complete the table series riddle by finding the number that can replace "??".

Which tank will fill first?

What always comes into a house through the keyhole?

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?

Spot 5 differences in two Christmas tree below:

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

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?

Solve this riddle by finding the odd one out from the rest.

Can you decipher the two rows to find the hidden word?