What goes up but never comes down?

Which five letter word can be added at the end of below word to form a
valid word?

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What is always in front of you but can’t be seen?

What will you call your mother's brother's brother-in-law?

What is so fragile that saying its name breaks it?

There is something which is always coming but never arrives?

The more it dries, the wetter it becomes. Can you tell what it is?

Which English verb becomes past tense just by rearranging the letters?

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

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