Directions: Each pair below has a blank in both sentences. Choose the one word that completes both sentences naturally.

(I) The coach's encouraging words gave the players fresh __________________ before the final round.
(II) The flashing signal acted as a __________________ that prompted the machine to begin operating.

The correct answer is energy.

To determine the word that completes both sentences naturally, let us analyze the context and meaning required for each blank:

Sentence (I): "The coach's encouraging words gave the players fresh __________________ before the final round."
In this sentence, the context demands a noun that refers to vitality, vigor, or renewed strength and enthusiasm. The word energy fits naturally into the phrase "fresh energy," describing how the coach's inspiring words reinvigorated the team prior to the final round of the game.

Sentence (II): "The flashing signal acted as a __________________ that prompted the machine to begin operating."
In this sentence, the context refers to a force, power source, or driving stimulus that causes a mechanical system to start functioning. Here, energy represents the active force or power signal that triggers the operation of the machine.

Evaluation of alternative options:
• document: A noun meaning a written record; it does not fit the context of revitalizing players or starting a machine.
• passionate: An adjective; both blanks require a noun, making this option grammatically incorrect.
• partner: Refers to a companion or associate, which makes no sense in either sentence.
• catalyst: While "catalyst" could fit sentence (II), it does not make natural sense in sentence (I) because "fresh catalyst" is an unnatural phrase when describing athletes receiving encouragement.

Thus, energy is the only choice that completes both sentences meaningfully and logically.