What goes through cities and fields, but never moves?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Name a key which is hardest to turn.

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

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

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

10+10 and 11+11 can give you the same answer.

Explain how?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Identify The phrase in the picture.