It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words. (2013·安徽,34)
New books have been given out to the students, _______is happy with the books.
We _______of the decision until midnight.
Many newly found old things _______ in the museum this month.
Upon _______ , she laughed and jumped, and then ran out of the room.
I have a lot of readings _______ before the end of this term.(2010 .山东)