补全对话
A：Hello, Steven, what are you doing for your summer vacation? B:I'll fly to Chengdu to visit my grandparents the day after tomorrow. A: ____
B: Oh no, not at all··
A: Flying is quick, isn't it?
B: Yes,____ What's more, it's often delayed(延误) and always crowded. A: But it's convenient and comfortable.
B: I don't think so. While in the plane, you can't walk around or open the windows. By the way, the seats are uncomfortable. There is not much choice of food and there are not enough toilets.
A: Is not much choice of food and there are not enough toilets. A:____
B: It's even worse. It takes hours to get out of the airports and into the city. A: Then you prefer travelling by train, don't you?
B: Yeah. ____They're cheaper, safer and more comfortable. If you miss a train, you can always catch another one later.
A: But trains are always much slower than planes.
B: ____Besides, today's high-speed rail is also fast and comfortable.
A: I agree with you .Have a good time!
B: Thank you very much.
A: How's the food there?
B: I don't think that speed is everything! C: What's your plan? D: Trains are much better than planes. E: What happens when the plane lands? F: Do you like travelling by plane? G: But you have to wait for hours before the plane takes off.
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B={1，3，5，7}，则( )