补全对话,mei空一词,一共10词. A:()me,Mary.()these your pencils?B:(),they are Helen,s.A:And() this her eraser?B:No,it().lt,is Dale,s.A:What()this ruler?B:lt,s Cindy s.And the pen is ().too.A:And the dictionary?Is that yours?B:Yes,is,s() A:Thank you() your help.Mary.b:You,re)()