把对话补充完整，并将序号写在横线上。
A. Please open the book. B.Good morning, Xiao Li . C.I’m sorry, teacher.
( )Our classroom is _____________ the second floor.
A. inB. onC. near
( )_____________ this a library?
A. isB. IsC. Are
( )What time is it? _____________
A. It’s 7 o’clock.B. Time for P.E. C. It’s time for lunch.
( )_____________ is my brown jacket ? It is on the chair.
A. WhatB. HowC. Where
( )Is this a teacher's desk? Yes, _____________.
A. he isB. it isC. she is