--_____is the post office ?--- Go straight and turn right.
_______ 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.