Choose the correct answer

1. The snow
   [hasn't been starting|hasn't started] yet.
2. It's cold. It
   [has snowed|has been snowing] all day.
3. Your hair is wet.
   [Have you been swimming|Have you swum]?
4. How long
   [have they been working|have they worked] on this project?
5. She
   [hasn't been travelling|hasn't travelled] to Athens before.
6. A new DVD store
   [has opened| has been opening] in our neighbourhood.