Libraries form a vital part of man's system of ............. and education . They make avaible - through bookd and a .............. of other media - knowledge that has been accumulated through the ages . People in all walks of life , including students , teachers , businessmen , government officials , and scientists , ................. library resources in their work . In addition , large ............... of people turn to libraries to satisfy a desire for knowledge . All in all , the library ranks ............ man's most useful service institutions Các từ cần điền vào chỗ chấm : communication , read , variety , numbers , among , use