补全对话.英语
A:_____me,Mary.______theseyourpencils?B:_____,theyareHelen's.A:And_____thishereraser?b:no,it___.It'sDale's.A:what____thisruler?B:It'sCindy's.Andthepenis____,too.A:Andthedictionary?Isthatyours?B:Yes,it's_____.A:Thankyou_____yourhelp,Mary.B:You're____.