46. I am sorry, I interrupted your dinner.
I apologized..............................................................
47. He does almost no work.
He hardly...............................................................
48. It's very difficult to leave here after such a long time.
It isn't .........................................................................................................
49. That restaurant is so dirty that no one wants to eat there.
It is such ........................................................................................................
50. You can't visit Moscow unless you get a visa.
If you .....................................................................................