--- This history book is of great value.--- Exactly. _____ can be enjoyed from it ______ you have a deep understanding of it, however.
--_______ is this backpack? --It’s yellow.
--______ is Jenny. -- I’m Gina.Nice to meet you.
--Is this _______ pencil case? --No, it’s ______ eraser.
--What’s this ________English? --It’s _______ apple.
代表“英国广播公司”的是:____。