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A:Excuse me,whats this/that in/on.?B:Its a.A:Thank you.B:Is this/that a?A:Yes,it is./No,it isnt.Its a B:Oh,I see.Is it/that a?A:Look,this is Helens family photo.B:Yes.Whos he?A:Hes.B:This is,I think.A:Yes,he/she is./No,he/she isnt.B:Is she/he.?A:Yes,he/she is./No,he/she isnt.May I come in?Come in,please.This is my.Whos she/he?Is he/she.?Whats the time?Lets.Homework:1.Recite the words and texts of Unit 13.2.Review Unit 45.