We don't know ___ to pay a visit to the old town.

         ______ you look at it, the fast, exciting pace of life in New York city is fascinating and will continue to fascinate more and more people.

Beijing was attacked by such a terrible sandstorm ______few citizens had ever experienced before. 

The new secretary is supposed to report to the manager as soon as she ______________.

------It was determination and willingness that made him a good actress. ------Yes, that is also______it takes to do anything very well.