What word is pronounced the same if you take away four of its five letters?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Can you find out which options fits best with the missing column?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Remove two matchsticks to make the below equation correct.

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

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?