—How many students are there in the classroom? ____. They are all in playground.
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.
—Miss Gao, I am feeling bored. Would you mind my ________ here?—You had better not, for smoking is forbidden in public now.