Is

---Excuse me, sir. Where is Prof. Smith’s office?   ---_________________.

—          . —It certainly is. The sun is shining and there is a pleasant breeze. —It's lovely.  

______ is the chief administrative official of a college or university faculty.

---Is Peter there? ---______, please. I’ll see if I can find him for you.

 Mr. Yang is very busy. He _____twelve hours a day. He will call you as soon as he ___ back.

My father thinks that I should listen to him whatever he says, and this is ____ I don’t quite agree.

—We never know _____the old man is.—They say he is a teacher.

--I think you are lost in the city, _____?--Yes, I am wondering where the Great Wall Hotel is.

Currently, Yueyang Hospital is not the only organization _____ promoting Yi jingjing.

Chinese is one of the official languages ____at the UN meetings