1.

　　A : Who ' s that ?

　　B : That ' s Jim ' s sister .

　　A : Who ' re they ?

　　B :They ' re Jim ' s father and mother .

　　2.

　　JIM : Oh good , it ' s LiLei . Hi , LiLei !

　　LILEI : Hello , Jim . Good ! You're at home . How are you ?

　　JIM : Fine , thank you . How are you ?

　　LILEI : I ' m fine , too , thanks .

　　JIM : Nice to see you . Please come in . This way , please .

　　LILEI : OK ! Thanks .