Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

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?

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

What part of the chicken has the most feathers?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

Why is a river so rich ?