Q:

The library, if used properly, is invaluable in helping you develop discernment. It is rich . . . ( 1 ) . . . information that goes far beyond the . . . ( 2 ) . . . of any one text book or course . . . ( 3 ) . . . your text book author does not make a particular . . . ( 4 ) . . . clear 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.
(3).
(A) if  
(B) While  
(C) When
(D)Suppose 

• 1
  A
• 2
  B
• 3
  C
• 4
  D