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Question 77. What is the announcement mainly about?
Question 78. What is mentioned about the exhibit hall?
Question 79. Why does the speaker say, "Mr. Donner ismaking preparations"?
Question 80. What did a technician do this morning?
Question 81. Why does the speaker say, "Plus, it's old and out-of-date"?
Question 82. What does the speaker suggest that the listeners do?