Complete the dialogue with the sentences in the box.
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Mr Brown, is Ms Xie, the assistant of our head teacher.
A. it
B. this
C. who
D. that
This morning I to a hotel to visit a friend.
A. have gone
B. has gone
C. went
D. go
Einstein was famous his Theory of Relativity.
A. for
B. as
C. by
D. This
The twins just got back Jiuzhaigou.
A. at
B. in
C. from
D. with