Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
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Question: How many er the strong force is due to the exchange of what?

Answer: The strong force is due to the exchange of what?


Question: When were ctenophore mnemiopsis leidyi introduced into The Black Sea and the Sea of Azov ahh actually I want to know when were fish larvae accidentally introduced into the Black Sea?

Answer: When were fish larvae introduced into the Black Sea accidentally?


Question: When did the plague return to Africa er sorry I want to know about Europe?

Answer:
When did the plague return to Europe?