Add word-pointers: for five years, for a long time, since 5 o’clock, for the whole day, for over two hours.

1. I have been studying English ________. Now I can speak it quite well.
2. Helen has been doing music________. She is a fine pianist now.
3. I have been looking for you ________. Where have you been?
4. You have been watching TV _______, I am sure your eyes are tired.