Which one of the following options will complete the phrasal verb in the following sentence?
The train slowed _____ and finally stopped.

Question

Accepted Answer

The correct answer to complete the phrasal verb in the sentence "The train slowed _____ and finally stopped" is Option 4: "down."

1. **Explanation for Option 4 ("down"):**
   - The phrasal verb "slow down" is commonly used to describe the action of reducing speed. In the context of the sentence, the train is decreasing its speed before coming to a complete stop. This usage is consistent with how "slow down" is typically employed in English to indicate a reduction in velocity or pace. Therefore, "down" is the appropriate word to complete the phrasal verb in this sentence.

2. **Explanation for why the other options are incorrect:**
   - **Option 1 ("up"):** The phrase "slow up" is not standard in English when referring to reducing speed. "Up" is often used in phrasal verbs to indicate an increase or completion, such as "speed up" or "finish up," which is contrary to the intended meaning of slowing down.
   - **Option 2 ("over"):** The phrase "slow over" does not exist as a recognized phrasal verb in English. "Over" is typically used in contexts indicating movement across or completion, such as "go over" or "take over," which do not fit the context of reducing speed.
   - **Option 3 ("about"):** The phrase "slow about" is not a valid phrasal verb in English. "About" is often used to indicate approximation or relevance, such as "talk about" or "think about," which do not convey the meaning of decreasing speed.

In conclusion, "down" is the correct choice to complete the phrasal verb "slow down," as it accurately describes the action of the train reducing its speed before stopping. The other options do not fit the context or meaning required by the sentence.