Can you find the missing piece of the Porsche?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

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

What Word am I Looking For ?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

How many letters are in the alphabet?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

The more you take me, the more you leave me behind.
Who Am I?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?