"He spoke so ___ that ...": adverb, not adjective (lucidly / fluently)

The same question, asked 2 times: 16 Sep 2025 S2*, 19 Sep 2025 S3. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
16 Sep 2025 S2
86 $Select the correct option: He spoke so ___ that even abstruse theories seemed digestible.$
Tap an option to check your answer.
Question 2
19 Sep 2025 S3
84 $Fill in the blank with the correct option: He spoke so _____ that the audience was mesmerized.$
Tap an option to check your answer.