春天是许多鱼类在河底产卵的季节。

Spring is the season when many fish are ___spawning on the riverbed.

这家工厂正在大量生产塑料制品。

The factory is ___producing plastic products in large quantities.

这个程序会在特定条件下自动生成新的任务进程。

The program automatically ___spawns new task processes under certain conditions.