根据对话内容，从A到F选项中，选出能填入空白处的最佳选项，每个选项只使用一次，选项中有一项为多余项。

A. How long will I have to wait? B. Where are you now? C. This is Scott Smith. D. How will you come? E. What's happening? F. Stay with her and don't move her.

A: Hello! This is 911. Who is that speaking?

B:Help! Help! Please help me!

A: Yes, sir.

B: My wife is seriously ill. She's having a heart problem.

A: Now relax, sir.

B: I'm on Lincoln Highway, about 15 miles from Washington Tunnel

A: OK. I'll send an ambulance (救护车) as soon as possible.

B:

A: For about ten minutes.

B: All right. What should I do while waiting?

A:

B: OK. Thank you and please hurry.