—Is Christmas ______ December 25th or 26th ? —25th, I think.
_______ of them has a dictionary and they can look up words in it.
----Do you know the woman called Yu Dan?----Yes. She is regarded _______ one of the best speakers in our country.
We should keep ______ in the reading –room.
— Mary, can you take good care of ________ while I’m not at home?— Of course, I can.
The girl ________ black hair is my sister.