Read the following announcement and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks.

Library Rules

Our well-equipped library has many books on different subjects, and the librarian is always (13) ________ to help you.

Please remember:

●     You may borrow only one book at a time. Return it (14) ______ time to avoid a fine.

●     You must not write, underline or (15) ________ library books.

●     Magazines, newspapers, and reference books cannot be taken home.

●     You (16) ________ pay for any book that you lose.

●     The library is a quiet place, (17) ______ keep silent while reading or studying here.