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

BOOKS

          Nearly all the discoveries that have been made through the ages can (31) ______ in books. The invention of the book  is one  of  humankind's  (32) ______ achievements, the importance  of which can not be evaluated . Books are very useful, providing us with both entertainment and information. The production of books began in Ancient Egypt, though not in  the  form  that  is  accessible  to  us  today.The  books  read  by  Romans,  (33) ______, have some similarities to the ones we read now. Until the middle of the 15^th century, in Europe, all books were written by hand. They (34) ______ often  beautifully  illustrated  and  always  rare  and  expensive.  With  printing  came  the  possibility  of cheap,  large  publication  and  distribution  of  book  making  (35)  ______ more  widespread  and reliable.

Điền vào số (33)