Nine thousand guests took part in the outdoor ceremony, that impressed so many people at the White House.
An artist who was recently traveling on a ferry to the southern island discovered ______ a long lost antique Greek vase.
Mrs. Smith finds it hard to clear up the mess, as her children are always ____ whenever she tries to.
(2013·北京卷) I have an appointment Dr. Smith, but I need to change it.
(2013·大纲卷)A serious study of physics is impossible some knowledge of mathematics.
It will be a big help if you go to the store and get what we need for dinner._____, I’ll set the table.