A、A single room. B、A double room. C、A twin room. D、A triple room. B根据对话开头的A double room可知，男士想要订的是双人间。

W: Hello, Reception. May I help you?
M: Yes, I’d like to book a room for tomorrow.
W: Which kind of room do you prefer, sir?
M: (8) A double room. How much is it?
W: (9)A standard double room is $ 50 per night. But we offer 20% discount this month.
M: Oh, that’s great. How about the environment?
W: (10)It’s very comfortable, with a view of the sea.
M: OK, I’ll take it. My name is Martin.
W: OK, Mr. Martin. See you tomorrow.
M: Thank you. Bye!
8. Which kind of room does the man want to book?
9. How much is the double room?
10. How is the living environment of the room?