What is so fragile that saying its name breaks it?

What am I?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

When it's bad luck to meet a black cat?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

What Does this text mean:

important=important

Decode the movie name from the below picture?

There are 4 big houses. They are made from the materials: red marble, green marble, white marble and blue marble.

* Mrs Jennifer's house is somewhere to the left of the green marble one and the third one alone is white marble.
* Mrs Sharon owns a red marbles house and Mr Cruz does not live at either end, but lives somewhere to the right of the blue marbles house.
* Mr Danny lives in the fourth house, while the first house is not made from red marble.

Who lives where, and what is their house made from?