Complete the dialogues with the polite phrases from the box thank you,come in.make yourself at home! ; enjoy yourselves! ; good luck! take care of yourself! ; of course,you may.help yourself! 1.hi,betty! happy birthday! - 2.may i have a glass of orange juice,please? - 3.what a nice party! we like dancing so much.- 4.i'm going on an expredition next week! -