根据句意及首字母提示，填写单词。

1. My uncle is a farmer. He works on a f_______.

2. Look! The new furniture is made of w_______.

3. Wash your hands and wipe them with the t_______.

4. You should w_______ these flowers every day.

5. I will help Grandma l_______ the fire.

十水碳酸钠为透明结晶，其Na₂CO₃百分含量为（），结晶水百分含量为（）。