context: The trick is that you can't use adjectives or adverbs.
answer_0: Naturally, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_1: By comparison, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_2: Thereby, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_3: Simultaneously s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_4: Surely, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_5: Firstly, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_6: Afterward s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_7: Frankly, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_8: Slowly, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.
answer_9: Coincidentally, s, we had 20 minutes to write a poem, though it didn't have to use those words or be about the walk.