Answer:
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
What is it that you must give before you can keep it.
A man parks his car outside of a hotel and immediately realises he is bankrupt. How did it happen?
Double my number, I'm less than a score. Half of my number is less than four. Add one to my double when bakers are near. Days of the week are still greater, I fear.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?