This question tests your understanding of English idioms. The phrase "spilled milk" is part of a common idiom. An idiom is a phrase or expression whose meaning is not predictable from the usual meanings of its individual words.

The complete idiom is: "There's no use crying over spilled milk." This means it is pointless to be upset or worry about something bad that has already happened and cannot be changed.

Let's analyze the options:

• To cry: This is the correct word that completes the idiom.
• To boil: This is incorrect. "To boil" refers to heating a liquid, not expressing emotion.
• To save: This is incorrect. "To save" means to keep something for future use, which doesn't fit the context of an irreversible past event.
• To serve: This is incorrect. "To serve" means to present food or help someone, which is unrelated to the idiom's meaning.

Therefore, the most appropriate option to fill in the blank is "To cry".

Related Topic: Idioms

Idioms are fixed expressions with figurative meanings. They are an important part of vocabulary and make language more colorful. The meaning of an idiom is different from the literal meaning of the words it contains. For example, "break a leg" means "good luck," and "piece of cake" means "something very easy."

Key Takeaway

When encountering fill-in-the-blank questions, look for clues that point to a common phrase or idiom. Recognizing these fixed expressions is crucial for selecting the correct answer.