Answer: Sunk
Explanation: The word sunk is the past pretense of sink. Plus if the sentence didn't say The Red army has just sunk the Blue Army's submersible (or submarine) it wouldn't make any sense any other way. Hope this answer you queries! UwU
Answer:
interest
Explanation:
Interest is percentage paid on an amount of money. Interest is paid on a loan, credit, or mortgage.
So the question How much is the interest on that loan? makes perfect sense.
"Both of the children are ready to take the test" is the only sentence that uses a verb that agrees with its pronoun subject. The others have issues with the number.