The passage below has gaps. Immediately following each gap, four options are provided. Choose the most appropriate option for each gap. If one is looking fo...

The passage below has gaps. Immediately following each gap, four options are provided. Choose the most appropriate option for each gap. 

If one is looking for a particular book, he can either use the __6__ [A. reverse catalogue B. borrower's catalogue C. dictionary catalogue D. title catalogue] or the __7__ [A. author catalogue B. book catalogue C. title catalogue D. yearly catalogue] to locate the position of the book on the __8__ [A. table B. shelf C. cupboard D. desk] This can be done through the __9__ [A. borrower-mark B. reserve-mark C. call-mark D. year-mark] identification number. On the other hand, if the student has no particular book in mind, but wants to borrow any on a particular subject, say Mathematics, he can go to the __10__ [A. subject catalogue B. publisher catalogue C. reference catalogue D. cover catalogue]. There he will find the __11__ [A. book-card B. call-card C. author-card D. seller-card] of every book that deals with Mathematics as a subject. Apart from this, since all the shelves have instructions and numbers regarding the books on them, the person can read the __12__ [A. card's guide B. author's guide C. shelf-guides D. book-guides] and the book __13__ [A. acknowledgements B. commentaries C. titles D. spines] to get the book he wants. He can take the book to the __14__ [A. table B. reserve section C. sitting corner D. lending desk] where the library assistant removes the book card from the book __15__ [A. pocket B. title C. call-names D. reserve] and record the borrower's name on it. 

Choose the option that best fills the gap labelled 10