27.Don’t you think it essential that every resident of Nanjing___________spare no effort to make contributions to Nanjing 2014 Youth Olympic Games?
_____ surprised me most was to see so many people waiting for my arrival.
--- Why did you call the police? --- I got home and found my house _____.
The government has taken some measures to prevent more trees from _____.
Susan, _____ university student from Europe, teaches me _____ art in her spare time.
It was the first time Mary _____ such a big opening ceremony.