Mr Black gave us _________on how to learn English well.
---What _____ useful book! And ______ book is popular with students. A. a, a B. a, the C. the , the
How dirty your rooms are! You need to ___________.
_________ her mother, she became a famous scientist.
The dog had _____ serious toothache so its owner took it to _____ animal doctor.
I _______ in London, but now I live in New Yorker.