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They discovered the cause of the fire accidentally. They discovered it _______.
#27581
A
fortunately
B
by chance
C
all of a sudden
D
on purpose
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He invited me to a dance after the show_______Christmas Eve.
#29134
A
at
B
on
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in
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by
He has been        the computer for two hours, chatting with a boy from Australia.
#25458
A
in
B
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I know nothing about the match        I read in the newspaper．
#26748
A
besides
B
expect
C
except that
D
except what
We have brought in a good grain harvest for three years_________.
#26888
A
on purpose
B
on end
C
on duty
D
on watch
Before you pay a visit to a place of interest，look in your local library________a book about it.                                                                    (2013·安徽，22)
#25264
A
on
B
at
C
for
D
to