Choose the letter A, B, C or D to complete the passage below
What do you do if you want to (21) ______ a book in a library? If you know the author’s (22) ______, go to the author catalogue. Find the title of the book (23) ______ check the shelf mark. Make a note of this before you look (24) _______ the appropriate shelf. If you do not know the author’s name, go to the (25) ______ catalogue. If there (26) _______ no title catalogue in the library, go to the subject catalogue. Check all the titles which are under the (27) ______ you want. Then check the appropriate card, as with the author catalogue. Next look for the book on the shelf. Let the librarian stamp it (28) _______ you take it out of the library. If the book isn’t on the shelf, ask the librarian to get it for you.
(21) ______
