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!