Next month we will pay a visit to Paris,_________we'll stay for four days.
A. where
B. when
C. That
D. which
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Yesterday Professor White_________to the library and unexpectedly found a very useful book.
A. set off
B. took away
C. dropped in
D. broke into
This shows that they do not understand the (important)_________of the question.
The(celebrate)_________didn’t end until midnight.
They took part in all kinds of social(act)_________on campus.