A : ________ shirt is this? B : It's ________ shirt.
Who's that man?A.He's Mr. Black. B.She's my mother.
How many birds can you see?A.How nice! B.I can see thirteen.
I'm sorry.A.It's OK! B.Thank you!
Where are you from?A.I'm from China. B.I' m a student.
— that boy ? — my bother ?A.Who ; he’s B.Who’s ; He’s