Audio Wont Play In Page Script

I am using a code from majestics slender kit.... I am editing it to play music and stop it depending on how many pages have ben collected. the audio wont play for some reason... anyone know what i did wrong???? i am new to coding so please be patient with me... thanks

 #pragma strict
     @script RequireComponent( AudioSource )
      
     var pages : int = 0;
     var pagesToWin : int = 8;
     var distanceToPage : float = 2.5;
      public var pagePickup : AudioClip;
      var theEnemy : EnemyScript;
      
      public var FirstPage : AudioClip;
      public var thirdpage : AudioClip;
      public var FifthPage : AudioClip; 
      public var SeventhPage : AudioClip;
     
     function Start()
     {
     Screen.lockCursor = true;
      
     // find and store a reference to the enemy script (to reduce distance after each paper is collected)
     if ( theEnemy == null )
     {
     theEnemy = GameObject.Find( "Enemy" ).GetComponent( EnemyScript );
     }
     }
      
      
     function Update()
     {
     //if ( Input.GetMouseButtonUp(0) ) // use E in editor as LockCursor breaks with left mouseclick
     if ( Input.GetMouseButtonDown(0) || Input.GetKeyDown(KeyCode.E) )
     {
     //var ray = Camera.main.ScreenPointToRay( Input.mousePosition ); // always cast ray from center of screen
     var ray = Camera.main.ScreenPointToRay( Vector3( Screen.width * 0.5, Screen.height * 0.5, 0.0 ) );
     var hit : RaycastHit;
     if ( Physics.Raycast( ray, hit, distanceToPage ) )
     {
     //if ( hit.collider.gameObject.tag == "Paper" )
     if ( hit.collider.gameObject.name == "Page" )
     {
     pages += 1;
     //Debug.Log( "A Page was Collected. Total papers = " + papers );
      
      audio.PlayClipAtPoint( pagePickup, transform.position );
       Destroy( hit.collider.gameObject );
      
      if ( pages==1 )
    audio.PlayClipAtPoint( FirstPage, transform.position );
    }
     if ( pages==3 )
    {
    audio.Stop();
    audio.PlayClipAtPoint( thirdpage, transform.position );
    audio.Play();
    }
     if ( pages==5 )
    {
    audio.Stop();
    audio.PlayClipAtPoint( FifthPage, transform.position );
    audio.Play();
    }
     if ( pages==7 )
    {
    audio.Stop();
    audio.PlayClipAtPoint( SeventhPage, transform.position );
    audio.Play();
    }
     // make enemy follow closer
     theEnemy.ReduceDistance();
     }
     }
     }
     
     
      
     function OnGUI()
     {
     if ( pages < pagesToWin )
     {
     GUI.Box( Rect( (Screen.width * 0.5) - 60, 10, 120, 25 ), "" + pages.ToString() + " Pages" );
     }
     else
     {
     GUI.Box( Rect( (Screen.width/2)-100, 10, 200, 35 ), "All Pages Collected!" );
     // Application.LoadLevel( "sceneWin" );
      }
      }