Will you please stay here? .A. No, I am not B. No, you are not C. No, I'm afraid I can't
--- _______ is the Changjiang River? --- It’s more than six thousand kilometers long .
I’m going to _______ some books .
--- _______ is the moon ?--- It’s millions of years old.
This book is different ___ that book.
They _____ in a Chinese restaurant last Saturday.