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.
