multiply|multiplied|multiplying

细菌在适宜条件下会迅速繁殖。

Bacteria can ___multiply rapidly under favorable conditions.

兔子在理想条件下繁殖得很快。

Rabbits ___multiplied quickly under ideal conditions.

社交媒体上的谣言正在迅速扩散。

Rumors on social media are ___multiplying quickly.