---- The box is too heavy to carry. What’s in it?---- Oh, it is ___________ books.
I have a book. _______ book is in the bookcase. A. A B. An C. The
代表“英国广播公司”的是:____。
_________. Is this your pen?
Thank you _____ your help.
This is ______ ruler and that’s ______ eraser.