补全空缺短句，奖励100HY^^[cloze] But on the Caohai Lake in nearby Guizhou Province,__1__. Geng Zhongsheng is on his way to set out his net for the night. Geng's net is a strange tubular contraption with a closed-off end. More than a hundred fishermen__2__. Its mineral-rich waters are highly productive and there are nets everywhere.

The next morning, Geng returns with his son to collect his catch. At first sight, it looks disappointing: tiny fishes, lots of shrimps and some wriggling bugs. Geng__3__. The larger fish are kept alive, the only way they'll stay fresh in the heat. Surprisingly, some of the bugs are also singled out for special treatment. They are the young stage of dragonflies, predators that feed on worms and tadpoles. Nowhere else in the world are dragonfly nymphs harvested like this.

Back home, Geng spreads his catch on the roof to dry. This being in China,__4__. There's a saying in the far south:__5__. Within a few hours, the dried insects are ready to be bagged up and taken to market. It's the dragonfly nymphs that fetch the best price.

Fortunately, Caohai's dragonflies are abundant and fast breeding, so Geng and his fellow fishermen have so far had little impact on their numbers.__5__.[/cloze]