spawn|spawned|spawning

青蛙通常在春季到池塘边产卵。

Frogs usually go to the pond to ___spawn in spring.

这次技术创新催生了许多新的行业机会。

The technological innovation ___spawned many new industry opportunities.

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.