将下面句子排序，组成一段通顺的对话。
A. Is it in your school bag?
B. No, it isn’t.
C. Mum, where’s my pencil case?
D. Oh, look! It’s behind your ball.
E. Yes, here it is. Thank you, mum.
(     )     (     )     (     )     (     )     (     )