Select the most appropriate word to fill in the blank and make a meaningful sentence.

His old car ______ on the highway.

broke down

The most appropriate word to fill in the blank and make a meaningful sentence is:

☀ broke down

The sentence would read: "His old car broke down on the highway."

Explanation: "Broke down" is used to describe the sudden failure of a vehicle or machinery. In this context, it indicates that his old car stopped functioning properly while he was on the highway. The other options don't convey the same meaning:

• Broke up: This usually refers to the end of a relationship, not the condition of a car.

• Broke out: This typically refers to the occurrence of something sudden or unexpected, such as an outbreak of a disease or a fire.

• Broke in: This usually refers to entering a place illegally or forcibly, which doesn't fit the context of a car's condition.