补全对话, 每空一词。 A: Hello! May I ask you some questions? B: Sure. A: What's your name, please? B: Thomas Ruzic. A: You speak English well. How long 1._____ you 2._____ studying English? B: For three years. A: Oh. Have you 3._____ been to 4._____ English-speaking country? B: Yes, I have. I was an exchange student in the United States 5 three months. A: Really? When was that? B: When I 6._____ thirteen. A: 7 do you want to improve your English? B: I want to 8._____ around the world, and I need English to do that.