47. John is_____ most hard-working student I’ve ever known.
    A. the     B. Ø         C. a     D. an
48. The Titanic sank while it was crossing _____Atlantic ocean.
A. a                                 B. the    C. an    D. Ø (no article)
49. I went to _______ libreary to borrow some books.
A. a    B. an     C. the    D. X

50. My brother can play _______ piano beatifully.
A. a    B. an    C. the    D. no article
51. _______ sun gives us heat and light.    A. A        B. An        C. The        D. X
52. Peter didn’t go to school yesterday because he had _______ toothache.
A. a    B. an    C. the    D. no article
53. Laura’s brother is _______ engineer.
A. a    B. an    C. the    D. no article
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