Tom is writing email to his dad.A.a B.an C.the
A: ________ .B: Not at all.A.All right B.Here you are C.Thank you
A: ________ is David ?B: He is in the classroom.A.Where B.What C.Who
A:Is this your umbrella?B:________ A.Perhaps this is your umbrellaB.Yes, this is your umbrellaC.No, it's his umbrella
A: Come here, Yang Ling.B:________ A.All right B.Thank you C.Come in, please
A: Where's Yang Ling?B:________ A.She's a student B.She's at homeC.Yang Ling is my sister