Four small words, one right answer
meaning won't pick the preposition
When every option is a preposition, they all look possible. Guessing from meaning is slow and often wrong. The word just before the gap is the clue.
Varrowmere is famousdecides gap 1 ______ its lantern boats, and most visitors are keendecides gap 2 ______ the night market.
Two gaps, two different prepositions. Look left of each.