They were busy carrying earth in their mouths to stop up the

它们忙着用嘴衔土来堵住它们房子的门.
再问： . Just then the rain came down. I ran back into the house
再答： 正在那时雨下了起来，我跑进屋里。 我估计 mouths有误，所以意思连贯不进来。