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039.
W: This plane should have taken off half an hour ago.
M: I'm sorry for the delay. We'll be taking off shortly.
答案解析：
正确答案为B。根据This plane should have taken off half an hour ago. 飞机在半小时前就应该起飞了。可知，对话发生在机场，因此B项正确。
040.
W: Do you need some help, sir?
M: Actually, yes. Could you show me how to use my key card?
W: Yes, sure. You need to put your card in the slot. Then wait for green light and turn the handle.
答案解析：
正确答案为A。根据Could you show me how to use my key card? 你能告诉我如何使用房卡吗？key card是房卡的意思。可知，对话发生在酒店，因此A项正确。
