I．根据汉语写单词。
1. I haven’t heard from him since last _______________(一月)。
2. We should keep the _______________ (平衡) of the nature.
3. _______________ (冲浪) is one of the world’s most popular water sports.
4. Science is one of my favorite _____________ (科目)。 What about you?
5. Sandy has lots of ______________ (业余爱好)。
