In the following passage,some of the words have been left out. First read the passage over and try to understand what it is about. Then fill in the blanks with the help of the alternatives given. 

The library, if used properly, is invaluable in helping you develop discernment. It is rich....(1)....information that goes for beyond the....(2)....of anyone text book or course ….(3)....your text book author does not make a particular....(4)....c1ear and you feel the need....(5)....another description in greater detail....(6)....in other words, go to the library and....(7)....other books on the subject. By calling....(8)....two or three writers dealing with the ....(9)....topic, you will find some....(10)....of certain facts. In seeking additional sources, you will have gained immeasurably, for you will have seen what several experts perceive as being particularly important on a common subject.