Take this medicine and you will soon come- ?

The phrase “take this medicine and you will soon come round” utilizes the idiomatic expression “come round,” which means to recover from an illness or to regain consciousness. In this context, the speaker is likely reassuring the listener that the medicine will help them feel better or heal from a specific condition.

Examining the other options:

- A) over typically refers to overcoming a challenge or difficulty, but it doesn’t fit contextually as smoothly with the concept of taking medicine for illness.
- C) about is used in phrases like “come about,” which suggests changing direction or coming to a conclusion, making it less relevant in a medical context.
- D) down might imply sinking into a negative state, which contradicts the intention behind taking medicine, which is to improve one's condition.

Therefore, "come round" indicates a positive outcome associated with recovery, making option B the most appropriate choice in this context. The phrase implies a return to health or normalcy, which aligns with the expected effects of taking medicine.