1. I don't know _____ I can do for you.
2. — Could you tell me _____ the film begins, please?
    — About six o,clock.
3. He doesn't know _____ his father is so worried about him ?
4. — Do you know _____ he gets off the bus?
    — At the next stop.
5. Could you tell me _____ is the man standing over there?
6. Can you tell me _____ that's a fast train or not?