The simplest solution for pausing the slide is usually to just add a click box or a button to the slid and set their pause points to the same spot at some point before the end of the slide timeline.
But you say you have at least 5 such interactive objects on the slide and yet the slide refuses to pause? The only reasons that would normally be possible is if these objects are NOT set to pause the slide until the user clicks. Please check the Properties tab Timing for all of these objects. Are they perhaps set with pausing turned off?