补全对话。用适当的单词填空,使对话完整。 W: Summer vacation is coming. Where would you like to go, Jack? M: Well, I'd like ___ 1_ _ my grandparents in Dalian. W: Really? Dalian is a beautiful city. 2 are you leaving? M: I'm leaving next week. What about you, Mary? W: Oh, I'd like to go sightseeing in Sichuan. M: That's great. Sichuan is a good place to travel. 3 _ are you going there? W: By train. 4 the way, how long are you staying in Dalian? M: For three weeks. Who will you go with? W: My parents. They are 5 teachers. They are free m summer vacation. M: Have a nice vacation! W: You, too!