Everything was placed exactly ________ it used to be before she left the laboratory.
— Beijing or Shanghai? What did you mean? — We were talking about _______ go to college.
When he was a boy, he used to go there and watched _______.
Robert is said______ abroad, but I do not know what country he studied in.
Beijing was attacked by such a terrible sandstorm ______few citizens had ever experienced before.
He______ on this paper for ten minutes but he______only about sixty words.