Can anyone tell me a word in the English dictionary which has a silent 'z'?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

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

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

What do you see in the image below

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?