Read, circle and write.圈出藏在字母里的单词，然后在四线格上写一写。    

1. dfoodto _____                      

2. ghtable _____  

3. eatbntf  _____                         

4. bydrink _____

为防止进入汽轮机的蒸汽带水应采取哪些措施？