______ hero in this fairy story is _____ ugly duck.
A；The； the B. The；an C. The；a

—Oh， dear! What ______ so terrible?
—The food on the table goes bad. I’ll throw it away in a minute.

—Have you used the new computer ______? —Yes， I have. I have ______ used it.

---Did you borrow the comic book from the library?
---Yes. I _____ it for three days. I_______ it this afternoon.

---May I speak to Mr. Smith? --Sorry， he __________Beijing and he ________there for two weeks.