I recommend BBC over VOA. VOA can get bogged down in politics.

Of course. I recommend a excellent website to you.(http://www.putclub.com/ ) And a good method is to write what you have heard and then check it with the answer .If you practise this every day,your English will be improved effectively.Good luck :)

BBC is my choice because they have different programs on varied subjects... and it keeps your interest alive. Whichever you listen to, once you get accustomed to it, try the next step. Place yourself away from the source of sound and focus on a second job at hand. Let the words and sound pour into your ears, while your attention is on something else. By doing this you are actually enticing your brain to absorb, analyze and interpret the alien (English) words in a semi-conscious state of mind. Just imagine... you are working at your desk in the office, while two native speakers are talking loudly to each other 'over there' in the next room. Their voices are audible...and although your attention is focused on your job at hand, you can still comprehend what they are talking about.... and perhaps, even ready to shoot back a comment. This is how you can fine-tune your brain to absorb and interpret English words in the most natural way. And by the time you start feeling absolutely comfortable with this practice, you have already closed in on that magic 'switch' which you need to start 'thinking in English'. Hope it helps. Good luck ^^