A mother duck and her ducklings（幼鸭） were on their way to a lake． Suddenly， the mother duck_______ a fox not far away from them． She was_______ about her children， so she shouted to them， "Children， hurry to the ______． There's a fox!"

The ducklings hurried to the lake． The mother duck began to walk slowly to interest the_______．

When the fox saw her， he felt _______． He said to himself， "She is hurt． I can easily_______ her!" Then he ran towards her．

The mother duck began to run． She led the fox away from the lake． The ducklings already reached the lake． The fox ________ hurt them． She didn't worry any more，________she stopped running．

The fox thought she was tired． He ________ came closer to her． Just then， the mother duck flew and landed in the lake． Her ducklings_____ to her． The fox was very angry．