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15.
A. It's open only to teachers and postgraduates.
B. He can study there if he is writing a research paper.
C. Senior students can enjoy more rights than other undergraduates.
D. He needs the approval of his professor for the use of it.
16.
A. It was pretty good.
B. It was rather dull.
C. It was not well organized.
D. It was attended by many people.
