Hmm, I'm not quite sure either.The money would probably go to that person's family or relatives. If he or she had no relatives or family, then I'd assume that the bank would just keep it? This is only a guess though.

Overall, the most used word is the verb "to be" and all it's other forms. This is the same in basically every language though. For slang, which I'm guessing is what you mean, I agree with TheAngelicRose, it is definitely the word "like". People use it in practically almost every spoken sentence, though it is not often written. Kids, especially teenagers, generally use it more than adults.

Do you mean, what is the best way to make sure you remember English vocabulary, and not to forget it? If so, then the best way is to speak and right it at least somewhat often. When learning new vocab, the best way to get into your memory is to write out the word with your finger instead of a pencil. This way, you are literally feeling the word in your hand. I don't know the science behind why this helps, but my mom (who is a language teacher) told me that it is the best way to memorize things. So that you can see the word you are writing, you can write using a piece of paper and paint (by dipping your finger in the paint), by a big plate of something like flour or rice, or even just the dirt on the ground.

Actually it is not "what is the good method to learn english?" It would make more sense to say "What is a good method to learn English?"