Long Riddles and Answers

Question: I am very easy to get into,but it is hard to get out of me.What am I?

Question: The sky is blue, the sea is green. The answer never ends in-between.

Question: Keys! keys! So many keys, When F is involved The key note is _ ?

Question: How much does it worth to shoot a free throw in a game of basketball?

Question: There were 12 fish in a pond. Two drowned so how many fish were left?