读问句，选择对应的答句。

 ①Let's go to the library.                                    A. Yes, I do.

 ②Where is the teacher's office?                       B. Yes, it is.

 ③Do you have lunch at school?                         C. Forty-six.

 ④How many desks are there in your class?        D. OK.

 ⑤Is that your pencil?                                          E. It's on the first floor.