【2012浙江义乌】六、任务型阅读（本题有5小题，每小题1分，共5分）
英语中有许多俚语在日常生活中被广泛使用。请阅读下面几则俚语，理解他们的意思，然后完成任务。
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A. on the same page: having a basic understanding or agreement on something
B. up in the air: being unsure or undecided
C. let the cat out of the bag: giving away a secret
D. fire away: being allowed to ask somebody anything you want
E. miss the boat: being too late to take an opportunity（机会）
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选择上面适当的俚语完成71～75小题，使句子完整、通顺。请将其序号填入空白处。
71. A: You'd better go and buy the tickets for the concert as soon as possible, or you'll
▲ .
B: Thanks. I will do it this afternoon.
72. A: So where are you going on holiday this summer? B: I'm not sure really. It's still ▲.
73. A: Thank you for such an interesting talk. Could I ask some questions?
