The cat is very cute, ?A. is it ? B. isn’t it? C. is the cat
— Have you seen______ pen? I left one here this morning. — Is it___________ black one? I think I saw it somewhere.
Harry Potter is so interesting a book that lots of teenagers like to read _
— Could you please pass me the book?
—Merry Christmas! —_______.
The policeman caught the thief ______ has stolen Mr. Li’s computer.