根据句意及首字母补全在本课中出现的单词。 1. M_____ Christmas and Happy New Year! 2. Fish can't live w_____ water. 3. Let's d_____ our classroom before they come here. 4. Oh C_____ day,families open the presents they have give each other. 5. B_____ the way, how old are you? 6. There is a bird at the t_____ of the tree.