Final Answer:
The game shall be extended, and an additional five seconds shall be added to the clock to permit a shootout to be taken at or after the expiration of the half or the game.
Step-by-step explanation:
In this context, the blank is appropriately filled with the phrase "an additional five seconds." This rule pertains to situations in certain sports, particularly those involving shootouts, where there is a need to extend the game beyond its scheduled duration. The provision ensures that a fair opportunity for a shootout is granted even if the clock expires at the end of a half or the entire game. The use of "an additional five seconds" specifies the duration of the extension, allowing for the completion of the shootout.
Therefore, the answer is effectively conveyed with the addition of "an additional five seconds," accurately reflecting the stipulation for extending the game in the given scenario.