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

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

There is something which is always coming but never arrives?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

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

Can you find the odd one out from the below words ?

First Second Third Forth Fifth Sixth Seventh, Eighth Nine Ten Eleven Twelve.

What can you catch but never throw?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Can you name some countries which do not have the alphabet 'A' in them?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E