Use the sentences to complete the dialogue.

Whose is this guitar? / You're very lucky.
Your room is great ! / Is mar here ?

Steve: Hello, Mrs Brown. 1) ..........
Mrs Brown: Yes, he's in his room.
Steve: Thanks. ... Hi, Mark! 2) ............
Mark: Hi, Steve. Yes, it,s realy big.
Steve: You've got a TV, a DVD player and a computer. 3) ..........
Mark: It's my brother's.
Steve: 4) ............. . You've got everyting in your room!