题目内容：
根据以下资料，回答题。A. I'm free now
B. make sure
C. I'm afraid I can't make it
D. give me your number
E. who's calling
F. It's very kind of you
G. You're welcome
H. take care
Secretary：Good morning. Dr. Smith's office.
Wang：Good morning. May I speak to Dr. Smith，please?
Secretary：He's at a meeting just now. May I ask __1__ please?
Wang：This is Wang Xiaohong. I'm an exchange scholar from China. I've just arrived in the U.S.，and I'd like to discuss my research plans with Dr. Smith. I had an appointment with him at 2 p.m. this afternoon，but __2__. I'd like to reschedule it.
Secretary：Why don't you __3__ and I'll have him get back to you as soon as possible.
Wang：Sure. It's 965-4778.
Secretary：OK. I'll __4__ he gets the message.
Wang：Thank you.
Secretary：__5__. Goodbye.
Wang：Goodbye.
请在第_____处填上正确答案。
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答案解析：