Select the most appropriate homonym to fill in the blank.

The German Submarine __________ were not aware of the exact location of the ship.

crews

The correct homonym to fill in the blank is crews.

The sentence is about the German Submarine crews, who were not aware of the exact location of the ship. The word "crews" refers to the group of people who operate a ship or aircraft.

The other homonyms are not as appropriate.

• Cruise refers to a long journey by sea or air. This is not the right word to use, as it does not make sense in the context of the sentence.
• Crus is a rare word that means to wander or roam. This is not the right word to use, as it does not make sense in the context of the sentence.
• Cruse is a verb that means to sail or travel leisurely. This is not the right word to use, as it does not make sense in the context of the sentence.