What always comes into a house through the keyhole?

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

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

I don't get anymore wetter, no matter how much rain falls on me.

I add 5 to 9 and get 2. The answer is correct, so what am I?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

What can go through glass without breaking it?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?