Four levels, ten recordings each. The answer is always the speaker's own words. What changes is how far the printed sentence sits from the way they said it.
You hear: “We stopped using the north gate in the end. The surface there kept flooding after any real rain.”
The sentence says: The north gate was given up on account of , which worsened after heavy rain. → flooding
Two things to notice. First, on account of needs a noun, so flooded is the wrong shape even though it is the word you heard. Second, the printed sentence is built from two spoken sentences joined together — and the half after the gap, which worsened after heavy rain, is what confirms you have the right one. Students who stop reading at the gap answer this from the first sentence alone and put the north gate.
Carry into the mock: read the whole sentence, including the part after the gap, before you decide.